apselaphesis 
apselaphesis (ap-sel-a-fe'sis), )/. [NL., < Gr. 
a- priv. + ij/'/.d<j>t/a/.r, feeling, < ij//.a(f>av, feel, 
grope, touch, connected with V"/", touch, rub.] 
In pathvl., diminution or loss of tactile sensi- 
bility. 
apsidal (ap'si-dal), ((. [< //.< ((i/mid-) + -nl.] 
1. In astron., pertaining to the apsides. See 
a/mix. 2. In areli., of or relating to an apse; 
of the nature or form of an apse ; terminating 
in an apse. 
The prothesis and diaconicon (in Armenian churches] are 
never apsidal on the outside, and seldom so on the inside. 
J. Al. Nealc, Eastern Church, i, 174. 
Apsidal chapel. () A chapel terminating in an apse. 
(b) An apse-chapel. Apsidal surface, in ninth., a sur- 
face related to any other surface and to any point as l-'res- 
nel's wave-surface is related to the quadric -surface and 
to its center; that is to say, on each plane section of an 
original surface through a certain fixed point the radii 
from that point which cut the section orthogonally are 
taken, and distances MI mil to these radii are measured off 
from the fixed point on the perpendicular to the section ; 
then the locus of the extremities of these lines so mea- 
sured is the apsidal surface. 
apsidally (ap'si-dal-i), adv. In the form or 
manner of an apse ; with an apse. 
In this difficulty the architect hit upon the happy ex- 
pedient of finishing the roof westwards apsidally. 
Dean llowson, Handbook of Chester Cathedral, p. 40. 
apsides, . Plural of apsis. 
apsidiole (ap-sid'i-61), n. [F., commonly absi- 
diole, < NL. "apsidiola, dim. of L. apsis (apsid-), 
apse.] A small apse ; a secondary apse, as one 
of the apses on either side of the central or 
Apteryx 
VKTeaOat, nrijvai, fly), + Aimjc, diver, < Aveiv, 
dive, sink.] A genus of penguins, formerly co- 
extensive with the family Bphenisoidce, and giv- 
ing name to a family Apti j nodi/tid<i; but now 
usually restricted to two large species, the em- 
peror and king penguins, A. imperator and A. 
rex, or A.fnrsteri and A. pennant!, distinguished 
from all others by their great size and long, 
slender, somewhat curved bill. Both were for- 
merly called the great or Patagonia penguin, 
A. patachonica. Also Aptenodyta and Aptrro- 
dijta. 
Aptenodytidae (ap"te-no-dit'i-de), n.jiL [NL., 
< Apteiiodytcs + -id<e.] A family of birds, the 
penguins, named from the genus Aptetiodytes: 
synonymous with Sphemscidd' (which see). 
Aptera (ap'te-ra), ii.pl. [NL. (< Gr. avrepa, 
animals without wings, dnrepov, the class of 
such animals Aristotle), neut. pi. of apterus, 
< Gr. dirrepof, wingless: see apterous.] In2od7., 
a group to which various limits have been as- 
signed, (a) In the Linnean system of classification, the 
seventh and last order of Insecta, including "insects" with- 
out wings, that is, crustaceans, arachnidans, myriapods, 
etc. In 1795 it was divided by Latreille into seven or- 
ders: Si(ctoria,Thysanura, Paraxita, Acephala, Entomos- 
traca, Crustacea, and Myriapoda. (b) In Latreille's system 
of classification (1817), the fourth of nine orders of Insecta, 
including " wingless forms without gnathites," and con- 
taining only the fleas ; the Suctoria of De Geer, the Sipho- 
naptera of Latreille, the Aphaniptera of K irby and modern 
writers. Used in this sense also by Macleay and others. 
(<) Loosely applied to sundry groups of wingless insects 
besides fleas, as to the haustellate and mandibnlate lice, 
the thysauurous insects, etc. (d) In Oegenbaur's system of 
classification, one of the two prime divisions of Hexapoda 
or fnsecta (the other being Pteryyota), consisting of the 
two orders Collembola and Thysanura, containing all ap- 
terous ametabolous insects of such forms as Podura and 
Lipura, Campodea and Lepisma, etc. The name is practi- 
:ally synonymous with Ametabola (which see). 
., . ., m. L --Pteral (ap'te-ral), . [As apterous + -al.] 1. 
The paymaster and the attorney stood at hand apt with Destitute or wings. 2. In arch., applied to a 
suggestions. C. J. Bellamy, The Breton Mills, xiv. temple or other building which has no columns 
Capable of easy explanation ; natural ; on the flanks, but may have a portico at one or 
at each end : opposed to peripteral, surrounded 
by columns. See prostyle and amphiprostyle. 
apteran (ap'te-ran), n. [As apterous + -an.] 
A wingless insect; one of the Aptera. 
282 
The hands that have grasped dominion and held it have 
been large and hard; those from which it has slipped, 
delicate, and iijil for the lyre and the pencil. 
Loire/I, Fireside Travels, p. 251. 
2. Suited to its purpose ; apposite ; pertinent ; 
appropriate ; becoming : as, an apt metaphor. 
Such ttft and gracious words, 
That aged ears play truant at his tales, 
And younger hearings are unite ravished. 
fihak., L. L. L., ii. 1. 
Expert 
In fitting aptest words to things. 
Tennyxon, In Memoriam, Ixxv. 
Ludicrous yet apt citations 
Of barbarous law Latin. 
Wldttier, Bridal of Peuuacook. 
3. Having a tendency ; naturally susceptible ; 
liable ; likely : as, wheat on moist land is apt 
to blast or be winter-killed. 
It [the harbor) is gay with hundreds of small boats, . . . 
apt to be painted green and adorned with pictures. 
C. D. Warner, Roundabout Journey, p. 135. 
4. Inclined; predisposed; disposed customa- 
rily ; prone ; ready : as, one who is too apt to 
slander others. 
'Tis time my hard-mouth'd coursers to control, 
Apt to run riot, and transgress the goal. 
Dryden, Pythag. Philos., 1. 669. 
What makes you thoughtless in your conduct, and apt to 
run into a thousand little imprudences? 
Sheridan, School for Scandal, iv. 3. 
5. Ready; prompt; quick; unusually intelli- 
gent ; expert ; facile : as, a pupil apt to learn ; 
an apt wit. 
Strong, supple, sinew-corded, apt at arms. 
Tennyson, Princess, v. 
An ajit taster knows which wine has the novel flavor. 
Stedman, Poets of America, p. 289. 
6. Prepared; ready; willing. 
Live a thousand years, 
I shall not find myself so apt todie. i/"/*. i\ 
Shak., J. C., iii. 1. apteral (ap'te-ral), a. 
7t. 
credible. 
That Cassio loves her, I do well believe it ; 
That she loves him, 'tis apt, and of great credit. 
Shalt., Othello, ii. 1. 
the poisoner in the play in Hamlet says, ' hands apt, drugs teria. 
apterium + -al.] 
or to ap- 
Apsidioles. St. Sernin, Toulouse, I2th century. 
main apse in a church of triapsidal plan, or one 
of the apse-chapels when these project on the 
exterior of the church, particularly if the pro- 
jection resembles an apse in shape. Also writ- 
ten absidiole. 
apsis (ap'sis), n.; pi. apsides (ap'si-dez). [L. 
(pi. absid(B), a round arch or vault, the circle 
which a star describes in its orbit, a bowl, < Gr. 
<i</"'f (pl- fy'Ses), a loop, wheel, orbit, etc., < <JJT- 
TV, fasten, bind: see apt.] 1. In astron., a 
point in the eccentric orbit of a planet in which 
it is either furthest from or nearest to the body 
about which it revolves. The higher apsis is the 
point furthest from, and the lower apsis the point nearest 
to, the central body. The line of apsides is the line join- 
ing the apsides. These terms were originally applied to 
circular orbits, but are now extended to ellipses. Also 
apse. 
2. In arch., same as apse. 3. A reliquary or 
case in which the relics of saints are kept, 
especially one of a form imitating the curves 
of a dome or vault. 
Sometimes written absis. 
apsychical (ap-sl'ki-kal), a. [< Gr. a- priv. + 
tendency or inward inclination : as, apt to catch cold ; apt 
to neglect work ; when used of things, it similarly indi- 
cates natural tendency : as, apt to mold. Likely may sug- 
gest the same idea : as, he is likely to do it ; it is likely to 
pi. apteria (-'&). 
feathers: see dp- 
or space on the 
feathers grow; an un- 
feathered tract, in distinction from a feather- 
tract or pteryla (which see). Nitzsch ; Sunde- 
vall. 
that is, exposed to the danger of being hurt ; liable to 
Subject expresses what is likely to happen to a person or 
thing, and occasionally does happen. Liable to disease 
and subject to disease thus convey different ideas. The 
things to which we are liable are determined more by 
accident or circumstance ; the thmgs to which we are 
subject are determined by nature and constitution. Apt 
to be suddenly ill; liable, but not likely, to die before the 
physician arrives ; subject to attacks of epilepsy. 
How apt the poor are to be proud ! 
It is the duty of practical good sense to bear in mind 
that a certain result, though not certain to happen, is 
likely to happen, and that no wise man will put that likeli- 
hood out of sight. E. A. Freeman, Amer. Lects., p. 212. 
Till that hour 
Not liable to fear, or flight, or pain. 
Milton, P. L., vi. 397. 
All human things are subject to decay, 
And when fate summons, monarchs must obey. 
both to wingless insects belonging to winged 
groups, and to the wingless stage of winged 
insects, (b) Specifically, of or pertaining to 
the Aptera. 2. In bot., destitute of membra- 
nous expansions, as a stem or petiole : opposed 
to alate. 
Apteryges (ap-ter'i-jez), n. pi. [NL., pi. of 
Apteryx.] A superfamily group, made by New- 
ton an order, of ratite birds, based upon and in- 
cluding only the family Apteryyida; (which see). 
l - Apterygia (ap-te-rij'i-a), n pi. [NL., < Gr. 
(i- priv. + Trrepvyiav, a wing, fin : see Pterygia.] 
A group of mollusks, containing all gastropods 
with an intromittent male organ, and contrast- 
ing with the Pterygia, composed of the cephalo- 
pods and pteropods. Latreille, 1825. 
ticipated circumstances ; adapt, 
apterygian (ap-te-rij'i-an), a. '[< Gr. i 
wingless (see Apteryx)j'+ -ian.] 1. Wingless; 
Dryden, Mac Flecknoe, 1. 1. apterous. 2. Pertaining to the genus Apteryx, 
. [NL.,<^- 
family of ratite or 
apt (apt), a. [< P. apte = Pr. apte = Sp. Pg. 
apto = It. atto, < L. aptus, fit, fitted, prop. pp. 
of obs. apere, fasten, join (whence the incep- 
tive apisci, pp. aptus, reach after, try to seize), 
= Gr. oTrrciv, fasten, bind.] 1. Possessing the 
qualities necessary or proper for a certain pur- 
pose or end; fit; suited; adapted; suitable. 
All the men of might, . . . strong and apt for war. 
2 Ki. xxiv. 16. 
In woode and stone, not the softest, but hardest, be al- . ~. 
waies aptest. Ascham, The Scholemaster, p. 35. aptatet (ap tat), ! 
No man that putteth his hand to the plough, and looketh *'"'?' ada pt: see 
back, is apt for the kingdom of God. AptenodyteS (ap 
. 
That our speech be apted to necessaiy edification. 
Jer. Taylor. 
He takes his top-sail down in such rough storms, 
A $^^ 
aptablet (ap'ta-bl), a [ <L 
by the single genus Apteryx. It is characterized by 
the rudimentary condition of the wings and tail, 4-toed 
feet, very long slender bill with terminal nostrils, and many 
anatomical peculiarities, among them a better develop- 
ment of the diaphragm than in any other bird. 
Apteryginae (ap"te-ri-jrne), n. pi. [NL., < Ap- 
< L. aptatus, pp. of an- 
te. 
[NL., < Gr. 
r. t. [< L. aptati 
/ '' *'J j- ? ake 
. . . (cf. Gr. Airrf- 
, wingless). < Gr. a- priv. + Trrcptif (irrepvy-), 
genus of ratite birds, constituting the family 
omofGod. Apienoayies (ap-ie-no-ai tez), . mil., < ur. jtnlaniniaa TH i . ., *7 
Latter, Sermon , the Plough. dn>, wrngless (< a- priv. + 2**t winged, < mfnS" w *^3&'T%S%ft 
