inter- 
fix, being the adv. ami prop, inter used with 
verbs ami nouns, with the moaning 'between, 
iimonir. amid, during,' in some instances 
' under, do wn ': see inter 1 !.] A common prefix 
meaning 'between' or 'among' or 'during,' oc- 
(urriiig in niuny Knglish words taken from the 
Latin, eitherdirectly or through Middle English 
and Old French or French forms (being then 
in Middle Knglish also enter-, and so retained 
in some modern forms : see enter-), or formed in 
Kntrlisli on (lie Latin model. Words formed in 
English with this prcHx may have the second element of 
non-Latin origin, us in intcrdash, ittterknow, intertable, 
iHfertoeaoe, etc. The second element la (in the original) 
either a verb, as in interact, v., intercalate, intercept, in- 
terchange, etc.. or a noun, as In interact, n., interaxis, in- 
terval, Hitenalf, etc. The prefix is freely used in English 
in the making of new compounds, often without immedi- 
ate reference to its Latin status. In such cases, in the 
following etymologies, it is, for the sake of brevity, usually 
treated as an English prefix, and not carried back to the 
Latin preposition, as in other cases. For the relation of 
inter- to the second element in adjectives, compare the 
similar relation of ante-, anti-, etc. 
intcraccessory (in // ter-ak-ses / o-ri or in-ter-ak'- 
se-so-ri), a. [< inter- + accessory.'] In anat., 
situated between accessory processes of verte- 
bras: as, an interaccessory muscle. 
interacinous (in-ter-as'i-nus), a. [< L. inter, 
between, + NL. acinus, q. v.] Situated or oc- 
curring between the acini. 
The growth [of a tumor] is accompanied by a strong 
vascularization of the interacinoux connective tissue. 
Buck's Handbook o/Med. Sciences, III. 353. 
interact (in-ter-akf), . [= F. entr'acte = Sp. 
Pg. entreacto; as inter- + act, n.] In the drama, 
the interval between two acts, or a short piece 
between others ; an interlude ; hence, any in- 
termediate employment or time. 
interact (in-ter-akf), v. i. [< inter- + act, .] 
To act reciprocally; act on each other. 
The two complexions, or two styles of mind the per- 
ceptive class, and the practical finality class are ever in 
counterpoise, interacting mutually. 
Emerson, English Traits, xiv. 
interaction (in-ter-ak'shon), n. [< interact, v., 
after action.] Mutual or reciprocal action ; ac- 
tion or influence of things upon each other. 
The interaction of the atoms throughout infinite time 
rendered all manner of combinations possible. Tyndali. 
There can be no morality when there is not interaction 
between the moral subject and the moral object. 
H. N. Day, Princeton Rev., Sept, 1879, p. 811. 
interactional (in-ter-ak'shon-al), a. [< inter- 
action + -al.~] Pertaining to or of the nature 
of interaction. [Bare.] 
The sum of being consists of the two systems of sub- 
stantial forms and interactional relations, and It reappears 
in the form of concept and judgment, the concept repre- 
senting being and the judgment being in action. 
Kncyc. Brit., XXL 112. 
interactive (in-ter-ak'tiv), a. [< inter- + ac- 
tive.'] Mutually active; acting upon or influ- 
encing each other. 
These phenomena are ever intermingled and interac- 
tive. J. Fiske, Cosmic Philos., I. 39. 
interadditive (in-ter-ad'i-tiv), a. [< inter- + 
additive.'] Inserted parenthetically, or between 
other things, as a clause in a sentence. Cole- 
ridge. 
interagency (in-ter-a'jen-si), n. [< inter- + 
agency.'] The act or acis of one acting as an 
interagent; intermediate agency. 
interagent (in-ter-a'jent), n. [< inter- + agent.'] 
An intermediate agent. 
Domitian . . . tried by secret interagcnts to corrupt the 
fidelity of Cerialis. Gordon, tr. of Tacitus. 
inter alia (in'ter a'li-a). [L.: inter, among; 
aKa, neut. pi. ace. of alias, other: see alias."] 
Among other things or matters : as, he spoke, 
inter alia, of the slavery question, 
interallt, n. An obsolete variant of entraifl-. 
When zephyr breathed into the watery interall. 
O. Fletcher. 
interalveolar (in'ter-al-ve'o-lar), a. [< inter- 
+ alveolar."] 1. In zool., situated between the 
alveoli: applied to the transverse muscles which 
connect the apposed surfaces of the five alve- 
oli of the dentary apparatus of a sea-urchin. 
See lantern of Aristotle, under lantern. 2. In 
anat., situated between or among the alveoli 
of the lungs. 
interambulacr a. . Plural of in terambulacrum. 
interambulacral (in-ter-am-bij-la'kral), a. 
[= F. intcrtimbulin-ral; as inter- + ambulacra!.] 
1. In echinoderms, situated between ambula- 
cra; interradial. See cut under Astrophyton . 
Transverse muscles connect the two interambulacral 
pieces, the oral edges of which are articulated with a long 
narrow plate, the torus angularis. 
Huxley, Anat. Invert., p. 4S3. 
2. Of or pertaining to interanibulacra. 
3137 
interambulacrum (in-ter-am-bu-la'krum), n.; 
pi. inturiimbuliicra (-krH.). [< inter- + ambula- 
crum.] In cool,, one of the imperforate plates 
which occupy the intervals of the perforate 
of 
derms. See ambulacrum. 
plates, or ambulacra, in the shells of echiuo- 
interamnian (in-ter-am'ni-an), a. [< LL. inter- 
amnus, between two rivers, < L. inter, between, 
+ amn is, a river. ] Situated between two rivers : 
applied specifically to Mesopotamia. 
From one end of the Inter-amnian country to the other. 
Piazzi Smyth, Pyramid, p. 75. 
interanimate (in-ter-an'i-mat), v. t.; pret. and 
pp. interanimated, ppr. interanimatintf. [< in- 
ter- + animate.] To animate mutually. 
When love with one another so 
Jnteranimates two souls. 
Donne, The Ecstasy. 
interantennal (in'ter-an-ten'al), a. [< inter- 
+ antennae + -al.] Situated between the an- 
tennae : as, the interantennal clypeal region of 
a myriapod. Interantennal ridge, a longitudinal 
ridge or carina between the antenna), seen in many Hyme- 
noptera. 
interarborationt (in-ter-ar-bo-ra'shon), n. 
[< inter- + arbor 1 + -ation.] The intermixture 
of the branches of trees standing in opposite 
ranks. 
And though the inter-arboration do imitate the Areo- 
stylos, or thin order, not strictly answering the proportion 
of intercolumniations ; yet in many trees they will not ex- 
ceed the intermission of the columnes in the court of the 
Tabernacle. Sir T. Browne, Garden of Cyrus, iv. 
interarticular (in't6r-ar-tik'u-iar), a. [= F. 
interarticulaire ; as inter- + articular.] Situ- 
ated in a joint (that is, between the articular 
ends of the bones that compose the joint). 
Interarticular cartilage, fibrocartllage. See carti- 
lage. 
interarytenoid (in-tor-ar-i-te'noid), a. [< in- 
ter- + arytenoid.] Situated between the ary- 
tenoids. 
This Inflammatory action In the interarytenoid space is 
responsible for the spasmodic attacks characterizing per- 
tussis. Medical News, Lilt. 60L 
interatomic (in'ter-a-tom'ik), a. [< inter- + 
a torn + -ic. ] Existing or acting between atoms, 
especially those of a single molecule. 
It may be also [admitting] an interatomic energy, be- 
tween the atoms of the Individual molecules. 
Encyc. Brit., XVI. 611. 
interaulic (in-ter-a'lik), a. [< L. inter, be- 
tween, + aula, a hall: see aulic.] Existing 
between royal courts: as, "interaulic politics," 
Motley. [Bare.] 
interauricular (in'ter-a-rik'u-lar), a. [< in- 
ter- + auricula, auricle, + -ar&.] In anat., situ- 
ated between the auricles of the heart : as, the 
interauricular septum. 
interaxal (in-ter-ak'sal), a. [< interaxis + -al.] 
In arch., situated in an interaxis. 
interaxillary (in-ter-ak'si-la-ri). a. [< L. inter, 
between, + axilla, axil, + -ary.] In bot., situ- 
ated between the axils of leaves. 
interaxis (in-ter-ak'sis), . [< L. inter, be- 
tween, -I- axis, axis: see axis*.] In arch., the 
space between axes. 
interbastationt (in'ter-bas-ta'shon), n. [< in- 
ter- + baste$ + -ation.] Patchwork. [Bare.] 
A metaphor taken from interbastation, patching or piec- 
ing, sewing or clapping close together. 
J. Smith, Portrait of Old Age (1666X p. 184. 
interbedded (in-ter-bed'ed), a. Same as in- 
terstratified. 
Interbedded or contemporaneous [rock]. 
Oeikie, Encyc. Brit, X. 807. 
interblend (in-ter-blend'), v. t.; pret. inter- 
blended, pp. interblended or interblent, ppr. in- 
terblending. [< inter- + blend 1 .] To blend or 
mingle so as to form a union. 
Three divisions of the Apocalypse, though the first and 
second interblend imperceptibly with each other. 
E. a. Sean, Fourth Gospel the Heart of Christ, p. 100. 
interbrachial (in-ter-bra'ki-al), a. [< inter- + 
brachium + -al.] Situated between brachia, 
arms, or rays, as of a starfish ; interradial ; in- 
terambulacral : as, the interbrachial area of an 
ophiurian. 
The reproductive organs . . . open by orifices on the 
ventral surface of the body or in the interbrachial areas. 
//. .1. Nicholson, ZooL (5th i>d.), p. 196. 
interbrain (in'ter-bran), n. [< inter- + brain.] 
The diencephalon. 
interbranchial (in-ter-brang'ki-al), a. [< inter- 
+ bronchia: + -al.] Situated between or among 
branehire or gills. 
interbreed (iu-ter-bred'), c. [< inter- + breed.] 
I. trans. To breed by crossing species or varie- 
ties; cross-breed. 
intercalation 
H. intrans. 1. To practise cross-breeding, as 
a farmer. 2. To procreate with an animal 
of a different variety or species : as, hens and 
pheasants interbreed. 
interbreeding (in-ter-bre'ding), n. The pro- 
cess of breeding between different species or 
varieties; cross-breeding; hybridization. 
interbringt (in-ter-bring'), v. t. [< inter- + 
bring.] To bring mutually. 
Bless'd pair of swans, oh, may you interbring 
Daily new joys, and never sing. 
Donne, Eclogue, Dec. 26, 1613. 
intercalar (in-ter'ka-lfir), a. [= F. intercalate 
= Sp. Pg. intercalar = It. intercalare, < L. inter- 
calaris (also intercalarius), of or for insertion 
(dies or mentis intercalates, an inserted day or 
month). < intercalare, insert: see intercalate.'] 
Intercalary. 
Which is the cause that the king's reputing the third of 
these intercalar dales to be desusterous and dismal. 
Holland, tr. of Plutarch, p. 1062. 
intercalare (in-ter-ka-la're), n. ; pi. intercalaria 
(-ri-fi). I^NL., neut. of L. intercalaris : see in- 
tercalary?] The opisthotic bone of the skull. 
Gegenbaur; Cope. 
intercalary (in-ter'ka-la-ri), a. [= It. interca- 
lario, < L. intercalartusj equiv. to intercalaris : 
see intercalar.] 1. In chron., inserted in the 
calendar out of regular order, as an extra day 
or month; having an additional day or month, 
as one of a cycle of years. The lunar reckoning and 
other features of the Greek, Roman, and other ancient 
calendars made the year of twelve months too short, and 
intercalary days and months were officially added at Inter- 
vals to adjust the difference. Since the reformation of the 
calendar by Julius Ceesar, in 48 B. c., only one intercalary 
day in every fourth year, or leap-year, has been required:, 
the 29th of February. 
Ve Adar was an intercalary month, added, some years, 
unto the other twelve, to make the solar and lunary year 
agree. Raleigh, Hist. World, II. ill. i 6. 
Thenamesof the Parthian months were as follows: . . . 
together with an intercalary month inserted occasionally, 
called Embolimus. 
B. V. Head, Historia Numorum, p. 692. 
Hence 2. Inserted or coming between oth- 
ers; introduced or existing interstitially : as, 
intercalary beds in geology. 
How shall these chapters be annominated? Intercalary 
they shall not That word will send some of my readers 
to Johnson's Dictionary for its meaning; and others to 
Sheridan or Walker for its pronunciation. 
Suuthey, Doctor, intcrchapter i. 
The truth was that the poet began his career at an fii- 
tercalary transition period. Stedman, Viet. Poets, p. 209. 
3. In biol., intermediate in character between 
two types, yet not representing the actual ge- 
netic passage from one form to the other; in- 
terposed or intercalated, yet not biologically 
transitional. 
It seems not improbable that these ancient corals rep- 
resent an intercalary type between the Hexacoralla and 
the Octocoralla. Huxley, Anat Invert., p. 149. 
Intercalary days, (a) In chron., see def. 1, and bissextus. 
(b) In meil. , the days intervening between the critical days 
or crises of a disease. Intercalary growth, in bot., a 
form of growth observed in certain fungi and algee, in 
which the new part is intercalated into the old. In Kdo- 
gonium, for example, the cells frequently present a striated 
appearance at one extremity, the striation being the result 
of intercalary growth that is, just below the septum of 
the cell a ring or cushion of cellulose is formed, and at 
this point the cell-wall splits, as if by a circular cut, into 
two pieces, which separate from each other, but remain 
attached to the ring or cushion. The process is repeated, 
the next ring forming a little further away from the sep- 
tum. 
The typical form of intercalary growth takes place in 
definite belts which surround the cell. 
Betsey, Botany, p. 22. 
Intercalary verse, a refrain. 
intercalate (in-ter'ka-lat), v. t. ; pret. and pp. 
intercalated, ppr. intercalating. [< L. interca- 
lates, pp. of intercalare (> It. intercalare = Sp. 
Pg. intercalar = F. intercaler), proclaim the 
insertion of a day or month in a calendar, < in- 
ter, between, -I- calare, call: see calends.] 1. 
In chron., to insert in the calendar by procla- 
mation or authority, as an extra day or month. 
See intercalary, 1. 
In the time of Solon, and probably that of Herodotus 
also, it was the custom with Greeks to add, or, as it is 
termed, to intercalate a month every other year. 
Priestley, History, xiv. 
Hence 2. To insert between others; intro- 
duce interstitially ; interject or interpolate, as 
something irregular or unrelated. 
So wrote Theodoret in days when men had not yet inter- 
calated into Holy Writ that fine line of an obscure mod- 
ern hymn, which proclaims . . . that " There is no repen- 
tance in the grave." C. Kingsley, Hypatia. 
intercalation (in-ter-ka-la'shon), w. [= F. n- 
tercalation = Sp. intercalacion = Pg. intercala- 
cekt = It. intercalazione, < L. intercalatio(n-), < 
