icosahedral 
sahedral number, one of the numbers 1, 12, 48, 142, 255, 
456, etc., whose form is i (Sn-' 6 + 2). 
icosahedron (i 'ko-sa-he'dron), w. [Also written 
2972 
Icosteus (i-kos'te-us), . [NL., irreg. < Gr. fi- 
miv, yield, give way, + oariov, a bone.] The 
typical genus of the family Icosteida;, having a 
Regular Icosahedron. 
< Gr. c'utoeatipov, a body 
with twenty sides, neut. 
of eiKoa&tSpof, f (Koov'eo/jof , 
of twenty sides, < einoet, 
twenty (see icositni), + 
iSpa, a seat, base, = E. 
settle^, a seat.] A solid 
bounded by twenty 
planes. In the ordinary 
regular icosahedron the faces 
are equal equilateral trian- 
gles, equally inclined each to 
those adjacent to it. It has 12 vertices and 30 edges, 3 
edges per face, 6 edxes per vertex. Great icosahe- 
dron, a regular solid of which 
each face subtends at the 
center the space subtended 
by 4 faces and 6 half-faces of 
the ordinary icosahedron. It 
has 20 faces, 12 vertices, 30 
edges, 3 edges per face, 5 edges 
per vertex. Each vertex Is en- 
wrapped twice by the series of 
faces about it, and the cen- 
ter is inclosed seven times. 
Truncated icosahedron, a 
dyocffitriacontahedron formed 
by cutting down the corners of 
the icosahedron parallel to the 
faces of the coaxial regular dodecahedron until the ori- 
> that the solid has 2u 
Great Icosahedron. 
Icostfus fttigmaticta. 
naked body with some spinules along the later- 
al line, and quadriradiate ventrals. /. eniiimn- 
ticus is a deep-sea fish of California, 
icret, A word of dubious meaning and origin. 
See the second extract. 
As we find in the Survey booke of England, the king de- 
manded in manner no other tribute than certain Icret of 
Iron, and Iron barres. Holland, tr. of I'amden, p. 361. 
An icre is ten Bare Oibson, tr. of Camden (margin). 
-ics. [< -io + pi. -s 2 , after L. and Gr. plurals in 
-ic-a, -IK-O, neut. pi. of adjectives in -ir-its, -'i-6f, 
in names of sciences or arts, as in /UU)II/UITI- 
KO, mathematical (matters), interchanging with 
forms in the fern. sing. L. -ic-a, or -ic-e, Gr. -IK-I, 
(kKiariifui, knowledge, science, or rixvri, art, be- 
icosander (i-ko-san'der), . [< NL. icosandrun : 
see icosandrous.] In hot., a plant having twenty 
or more stamens inserted on the calyx. 
Icosandria (i-ko-san'dri-a), n. pi. [NL., < ico- 
sandrus, with twenty stamens: see icosandrous.] 
In bot., the twelfth class in the Linnean system 
of classification, distinguished by having twen- 
ty or more stamens inserted on the calyx, as in 
the rose family. The plants in this class pro- 
duce the most esteemed fruits, 
icosandrian (i-ko-san'dri-an), a. [< Icosan- 
dria + -ian.] Same as icosandrons. 
icosandrous (i-ko-san'drus), it. [< NL. icosan- 
drus, with twenty stamens, < Gr. eitinai, twenty, + 
avr/p (avdp-), a male (in mod. bot. a stamen) : see 
-androus.] Of or pertaining to the Icosandria. 
icosasemic (i^ko-sa-se'ruik), a. [< Gr. eluoai, 
twenty, + aijpa, a mark, aq/ieiov, a mark, mora.] 
In anc.pros., containing or amounting to twenty 
semeia or units of time ; having or constituting 
a magnitude of twenty morse or normal shorts: 
thus, a dactylic or anapestic pentapody is icosa- 
semic. Also spelled eicosasemic. 
icosian (i-ko'si-an), a. [< Gr. elicoai, dial. Atari, 
jSeuum, ftocarj, twenty, = L. riginti = E. twenty : 
see twenty.] Pertaining to twenty Icosian 
game, a game in which there are twenty stations each 
united with three others by paths, as the 20 vertices of 
an ordinary dodecahedron are connected by the 30 edges. 
Five stations being named- as consecutive, a player endea- 
vors to pass through all the other stations without passing 
through any one twice. 
icosidodecahedron (i'ko-si-do'dek-a-he'drqn), 
n. [NL. , < Gr. ducat, twenty, + <5<jdnca, twelve, 
+ fdpa, seat, base.] In geom., a solid of thirty- 
two faces formed by cutting down the corners 
of the icosahedron parallel to the faces of the 
coaxial regular dodecahedron until the new 
faces just touch at the angles, thus leaving 20 
triangular and 12 pentagonal faces. It is one 
of the thirteen Archimedean solids Truncated 
icosidodecahedron, a solid having 12 decagonal faces 
belonging to the regular dodecahedron, 20 hexagonal faces 
belonging to the icosahedron, and SO square faces belong- 
ing to the semi-regular triacontahedron. It is one of the 
thirteen Archimedean solids. 
icosihedral, icosihedron. See icosahedral, ico- 
sahedron. 
icositetrahedron (r'-'ko-si-tet-ra-he'dron), n. 
[NL., < Gr. e'tKoai, = E. twenty, + rirpa-, rerrapcf, 
= 'E. four, + eSpa, seat, base.] In crystal., a 
solid, belonging to the isometric system, which 
is contained by twenty-four similar four-sided 
planes ; a tetragonal trisoctahedron, or trape- 
zohedron. 
icosteid (i-kos'te-id), n. A fish of the family 
Icosteidce. 
(i-kos-te'i-de), n. pi. TNL., < Icosteus 
ete., these words follow the fern. sing, form ; in 
E. either or both forms are used: see exam- 
ples.] A termination of Greek origin, denoting 
a science or an art. Words with this termination are 
properly plural, butare now commonly regarded as singu- 
lar, being often accompanied by formsaetually in the singu- 
lar, as luatheiua'i''*, hydrostatics, esthetic* or esthetic, met- 
rics or metric, etc. In some cases the singular alone is In 
use, as In logic, music, the adjective being then exclusively 
in -ic-al, BAlvffical, musical, while in a few a distinction of 
meaning has grown up, as between physic and physics. 
Any adjective in -ic, applicable to a branch of knowledge, 
may have an accompanying noun In -ics. 
Icteria (ik-te'ri-a), n. [NL., < Gr. inrepof, a cer- 
tain bird: see Icterus.] A uotable genus of 
American oscino passerine birds; the yellow- 
breasted chats or chattering flycatchers. It was 
founded by Vieillot in 1807, and has been variously re- 
ferred to the Turdidce or thrushes, Vireonidte or greenlets, 
or made the type of the Icteriinat as a subfamily of Sylvico- 
lidce or Dendreecida. It is characterized by a stout com- 
pressed bill with high arched culmen, greenish coloration 
above, with bright-yellow breast and white abdomen, and 
a size unusual in the last-named family. The type is /. 
virens or /. viridix, which abounds in the United States, 
is migratory and insectivorous, a voluble and versatile 
songster with remarkable powers of mimicry, and which 
nests in shrubbery, laying usually four white eggs with 
reddish speckles. /. loiujicauda is another species or va- 
riety, inhabiting the southwestern portions of the United 
States. See cut under chat-. 
icteric (ik-ter'ik), a. and . [= F. icterique = 
Sp. icterico = Pg. icterico = It. itterico, < L. ic- 
tericus, < Gr. bcnpwif. jaundiced, < licrtppf, jaun- 
dice: see icterus.] I. a. 1. Affected with jaun- 
dice. 2. Preventing or dispelling jaundice. 
Icteric fever, icteric remittent fever, remitting ic- 
teric fever. See/ererl. 
H. n. A remedy for jaundice. 
icterical (ik-ter'i-kal), a. [< icteric + -nl.] 
Same as icteric. 
Our understandings, if a crime be lodged in the will, 
being like icterical eyes, transmitting the species to the 
soul with prejudice, disaffection, and colours of their own 
framing. Jer. Taylor, Works (ed. 1835), 1. 167. 
icterid (ik'te-rid), . One of the Icteridos. 
Icteridae (ik'-ter'i-de), n. pi. [NL., < Icterus 
+ -idee.] A large family of American oscine 
passerine birds with 9 primaries, a conic-acute 
bill with unnotchedtip, rictus without bristles, 
and angulated commissure. The family Is very 
closely related to the Fringillidce; it has also affinities 
with the CoriMce, and represents in America the Sturni- 
dee or starlings of the old world. There are upward of 
100 species, assigned to many genera, containing the birds 
variously known as American starlings, blackbirds, ori- 
oles or hangnests, meadow-larks, cow-birds, bobolinks, 
etc. The family is divided by Coues into four subfami- 
lies, Ageltxinte or marsh-blackbirds, Stumellince or mea- 
dow-larks, Icterirue or orioles and hangnests, and Quisca- 
lin(e or crow-blackbirds. A subfamily Icterince includes 
all the American orioles or hangnests and related forms. 
ent limits have been assigned. ( a ) In a restricted 
sense, fishes with a loose flaccid skin, unarmed head, long 
dorsal and anal fins with scarcely differentiated spines, 
and thoracic ventral fins: supposed to be related to the 
Stromateidte. It was constituted for two deep-sea fishes 
obtained off the California,, coast. (6) The faraily as above 
defined, together with the Katltymasteridai. It is scarcely 
distinguishable from Stromatetdee. 
icosteine (i-kos'te-in), . A fish of the family 
leosteidce. 
. .,. 
. the characters of the Ictenda; or 
icteritioUS (ik-te-rish'us), a. [< L. icterus, (jr. 
inTEpw;, the jaundice, + E. -it-ious.] Yellow j 
^nmno- t>io rAlrr nf imiTidiopd *kin 
. ^25 T^ifteritions 
ICteritOUS (ik-ter l-tus), a. bame as ictermous. 
icteroid (lk' te-roid), a. [< (rf. 'iKTtpOtlOVS, 
contr. 'iKTspofoK, jaundiced, < iivcpot, jaundice, 
+ eWof, form.] Yellow, as if jaundiced. 
ictus 
icterus (ik'te-rus), . [NL., < L. icterus, Gr. 
inTtpof, jaundice ; also a bird of a yellowish- 
green color, by looking at which, according to 
the simple therapeutics of the ancients, a jaun- 
diced person was cured the bird died; cf. 
licrepiaf (sc. ?./0of), L. icterias, a yellowish kind 
of stone.] 1. The jaundice. 2. In bot., a yel- 
low appearance assumed by wheat and some 
other plants under the influence of prolonged 
exposure to moisture and cold. 3. [cap.~\ In 
ornith., a Brissonian (1760) genus of birds, ap- 
proximately equivalent to the modern family Ic- 
teridw; subsequently used with various limita- 
tions, or as conterminous with the subfamily 
leterince; now restricted to the American ori- 
oles or hangnests, such as the ^Baltimore oriole, 
Icterus gttlbula. The type is technically con- 
sidered to be the troopial, Oriolus icterus (Lin- 
naeus), now called Icterus vulgaris. See cut 
under troopial. 4. [cop.] A genus of mam- 
mals. Griffith, 1827. 
ictic (ik'tik), a. [< L. as if *icticus, < ictus, a 
blow : see ictus.] Sudden or abrupt, as if pro- 
duced by a blow ; marked. Bushnell. [Rare.] 
Icticyon (ik-tis'i-on), 11. [NL.j < Gr. IKTIC, the 
yellow-breasted marten (taken in general sense 
of a 'weasel'), + uvuv, a dog, = E. liound.] A 
genus of Canidce with small molars, 1 above and 
2 below on each side, containing /. venaticus, 
the bush-dog of South America, a small, close- 
haired species with short limbs and tail. The ge- 
nus Is a peculiar one ; it is sometimes referred wrongly to 
the family Mustetitltx, but belongs to the tine dogs, Caninae, 
and is related to the African l.ycaon and the Indian Cyan. 
Lund, 1842. Also written Ictidacyun. 
ictide (ik'tid), n. An animal of the genus Ic- 
tideg (or Arctict is) ; a binturong: as, the black 
ictide, Ictides ater. 
Ictides (ik-ti'clez), n. [NL., irreg. < Gr. IKTIC, 
the yellow-breasted marten, + ticSof, form.] A 
genus of Viverridfe, of the subfamily Arctictinte, 
containing the binturongs : a synonym of Arc- 
tictis. 
Ictinia (ik-tin'i-S,), n. [NL., < Gr. 'mrlvof, a 
kite.] A notable genus of kites, of the subfam- 
ily Milvina: and family Falconidce, founded by 
\ ieillot in 1816. The tail is short and even ; the wings 
are moderate, with the third and second primaries long- 
est, and the first very short ; the feet are small ; the tarsi 
are scutellate in front ; the bill is small but robust, with 
very convex culmen and small subcircular nostrils ; and 
the plumage is dark-plumbeous or bluish. There are two 
species, both American, one of which is the common Mis- 
sissippi kite, /. subcoerulea or inixsi**ipi?iii<i.<, and the other 
the Houth American, /. plumlea. 
Ictiobinse (ik"ti-o-bi'ne), n. pi. [NL., < Ictio- 
bus + -ince.] A subfamily of Catostomidcu, 
with an elongate dorsal fin, compressed oblong 
body, and an interparietal fontanelle. It em- 
braces a few large fishes, inhabiting chiefly the Mississippi 
and Great Lake basins, known as bu/alu-fithes or biifaluei, 
and carp-suckers. See cut under carp-sucker. 
Ictiobus (ik-ti'o-bus), n. [NL., a perversion 
of Ichthyobus, < 'Gr. ljflb(, a fish, +_0oi>c, an ox 
(taken for 'buffalo': see buffalo).] A genus 
of fishes of the family Catostomidce, popularly 
known as buffalo-fishes, typical of the subfam- 
ily Ictiobina;. Rafinesque, 1820. See cut under 
carp-sucker. 
Ictitherium (ik-ti-the'ri-um), n. [NL., < Gr. 
IKTIC. the yellow-breasted marten, + 6r/piov, a 
wild beast.] A genus of fossil carnivorous 
mammals from the Miocene of Greece, of un- 
certain systematic position: supposed to be- 
long to the Viverridw, whence the name, given 
by Gaudry ; by others regarded as related to 
the Hyantidce. 
ictus (ik'tus), n.; pi. ictus. [L. ictus, a blow, 
stroke, stab, thrust; in prosody or music, a 
beating time, a beat; < ieere, pp. ictus, strike, 
hit, smite.] 1. A stroke: as, ictus solis, sun- 
stroke. 2. In pros, and music, rhythmical or 
metrical stress ; additional intensity of utter- 
ance or delivery distinguishing one time or syl- 
lable in a foot or series from the others. Metri- 
cal ictus in poetry is analogous to syllabic stress or accent 
in ordinary speech. In modem or accentual poetry an 
ictus regularly coincides with the syllabic stress or accent, 
primary or secondary. In classical or quantitative poetry 
the ictus was also a stress-accent, but was independent of 
the syllabic accent, which was a difference in tone or pitch. 
It regularly attached itself to a long time or syllable as 
contrasted with one or more shorts, but a long or longs 
could be metrically unaccented. The conflict between ic- 
tus and accent In ancient poetry may be exemplified by 
the line 
Connubio junoram sUbiK prtpritimque dicdbo 
(Virgil, .Eneid, I. IS), 
in which the accent is marked and the syllables bearing 
the Ictus are italicized. The part of a foot on which the 
ictus falls is called the thesis, and the rhythmically unac- 
cented part of the foot the arsis ; but many writers directly 
