Aquiform, ā′kwi-form, adj. having the form of water. [L. aqua, water, and Form.]
Aquiline, ak′wil-in, or -īn, adj. relating to or like the eagle: curved or hooked, like an eagle's beak. [L. aquila.]
Aquilon, ak′wi-lon, n. (Shak.) the north wind. [L. aquilo, -onis.]
Arab, ar′ab, n. a native of Arabia: an Arab horse, noted for its gracefulness and speed: a neglected or homeless boy or girl—usually Street or City Arab.—adj. of or belonging to Arabia.—adj. Arāb′ian, relating to Arabia.—n. a native of Arabia.—adj. Ar′abic, relating to Arabia, or to its language.—n. the language of Arabia.—ns. Ar′abism, an Arabic idiom; Ar′abist, one skilled in the Arabic language or literature; Ar′aby, a poetical form of Arabia. [L. Arabs, Arab-em—Gr. Araps.]
Araba, ar-ä′ba, n. a heavy screened wagon used by the Tartars.—Also Ar′ba and Arō′ba. [Ar. and Pers. arābah.]
Arabesque, ar′ab-esk, adj. after the manner of Arabian designs.—n. a fantastic painted or sculptured ornament among the Spanish Moors, consisting of foliage and other parts of plants curiously intertwined.—adj. Ar′abesqued, so ornamented. [Fr.—It. arabesco; -esco corresponding to Eng. -ish.]
Arabine, ar′ab-in, n. the essential principle of gum-arabic.
Arable, ar′a-bl, adj. fit for ploughing or tillage. [L. arabilis—ara-re, cog. with Gr. aro-ein, to plough, A.S. erian, Eng. Ear (v.t.), Ir. araim.]
Arachnida, a-rak′ni-da, n.pl. a sub-class of Tracheate Arthropoda, embracing spiders, scorpions, mites, &c., first separated by Lamarck from the Insecta of Linnæus.—adj. Arach′nidan.—n. and adj. Arach′noid, like a cobweb.—adjs. Arachnoi′dal, Arachnolog′ical.—n. Arachno′logist, one who devotes himself to the study of arachnida.—Arachnoid membrane, one of the three coverings of the brain and spinal cord, situated between the dura-mater and the pia-mater, non-vascular, transparent, thin. [Gr. arachnē, spider.]