Part 60

A`pi*ol"o*gy (?), n. [L. apis bee + -logy.] The scientific or systematic study of honey bees.

A*plan`o*ga*mete" (?), n. (Bot.) A nonmotile gamete, found in certain lower algæ.

||A*pla"si*a (?), n. [NL.; Gr. &?; priv. + &?; a molding.] (Med.) Incomplete or faulty development.

Ap`neu*mat"ic (?), a. [Gr. &?; not blown through.] (Med.) Devoid of air; free from air; as, an apneumatic lung; also, effected by or with exclusion of air; as, an apneumatic operation.

A*poc"a*lypse (?), n. (Eccl.) One of a numerous class of writings proceeding from Jewish authors between 250 b. c. and 150 a. d., and designed to propagate the Jewish faith or to cheer the hearts of the Jewish people with the promise of deliverance and glory; or proceeding from Christian authors of the opening centuries and designed to portray the future.

Ap`o*chro*mat"ic (?), a. [Pref. apo- + chromatic.] (Optics) Free from chromatic and spherical aberration; -- said esp. of a lens in which rays of three or more colors are brought to the same focus, the degree of achromatism thus obtained being more complete than where two rays only are thus focused, as in the ordinary achromatic objective. -- Ap`o*chro"ma*tism (#), n.

Ap`o*co*de"ine (?), n. [Pref. apo- + codeine.] (Chem.) An alkaloid, &?;, prepared from codeine. In its effects it resembles apomorphine.

Ap`o*se*mat"ic (?), a. [Pref. apo- + sematic.] (Zoöl.) Having or designating conspicuous or warning colors or structures indicative of special means of defense against enemies, as in the skunk.

Ap`os*tol"ic del"e*gate. (R. C. Ch.) The diplomatic agent of the pope highest in grade, superior to a nuncio.

||Ap`pel" (?), n. [F., prop., a call. See Appeal, n.] (Fencing) A tap or stamp of the foot as a warning of intent to attack; -- called also attack.

{ Ap`pen*dec"to*my (?), Ap*pend`i*cec"to*my (?) }, n.} [Appendix + Gr. &?;, fr. &?; excision.] (Surg.) Excision of the vermiform appendix.

Ap*pen"dix, n. The vermiform appendix.

||Ap*pen"dix ver`mi*for"mis (?). [NL.] (Anat.) The vermiform appendix.

Ap*pos"a*ble (?), a. (Anat.) Capable of being apposed, or applied one to another, as the thumb to the fingers of the hand.

Ap*proach", n. (Golf) A stroke whose object is to land the ball on the putting green. It is made with an iron club.

||Ap`pui" (?), n. (Man.) The mutual bearing or support of the hand of the rider and the mouth of the horse through the bit and bridle. -- Point d'appui (&?;), any point of support or basis of operations, as a rallying point.

||A*ra"ba (?), n. [Written also aroba and arba.] [Ar. or Turk. 'arabah: cf. Russ. arba.] A wagon or cart, usually heavy and without springs, and often covered. [Oriental]

The araba of the Turks has its sides of latticework to admit the air

Balfour (Cyc. of India).

||Ar`a*ro"ba (?), n. [Tupi.] 1. Goa powder.

2. A fabaceous tree of Brazil (Centrolobium robustum) having handsomely striped wood; -- called also zebrawood.

Arc (ärk), v. i. [imp. & p. p. Arcked (ärkt); p. pr. & vb. n. Arcking.] (Elec.) To form a voltaic arc, as an electrical current in a broken or disconnected circuit.

Ar"chi*bald wheel (?). A metal-hubbed wheel of great strength and elasticity, esp. adapted for artillery carriages and motor cars.

Ar"cho*plasm (?), n. [See Archon; Plasma.] (Biol.) The substance from which attraction spheres develop in mitotic cell division, and of which they consist.

Arc light. (Elec.) The light of an arc lamp.

Ar`dois" sys"tem (?). (Naut.) A widely used system of electric night signals in which a series of double electric lamps (white and red) is arranged vertically on a mast, and operated from a keyboard below.

{ A*re"co*line (?), n. Also - lin }. [From NL. Areca, a genus of palms bearing betel nut.] An oily liquid substance, C8H13O2N, the chief alkaloid of the betel nut, to which the latter owes its anthelmintic action.

||A`rête" (?), n. [F., lit., a sharp fish bone, ridge, sharp edge, fr. L. arista beard of grain.] (Geog.) An acute and rugged crest of a mountain range or a subsidiary ridge between two mountain gorges.