Part 336

Ar"a*bin (&?;), n. 1. (Chem.) A carbohydrate, isomeric with cane sugar, contained in gum arabic, from which it is extracted as a white, amorphous substance.

2. Mucilage, especially that made of gum arabic.

Ar"a*bin*ose` (&?;), n. (Chem.) A sugar of the composition C5H10O5, obtained from cherry gum by boiling it with dilute sulphuric acid.

Ar"a*bism (&?;), n. [Cf. F. Arabisme.] An Arabic idiom peculiarly of language. Stuart.

Ar`a*bist (&?;), n. [Cf. F. Arabiste.] One well versed in the Arabic language or literature; also, formerly, one who followed the Arabic system of surgery.

Ar"a*ble (&?;), a. [F. arable, L. arabilis, fr. arare to plow, akin to Gr. &?;, E. ear, to plow. See Earable.] Fit for plowing or tillage; -- hence, often applied to land which has been plowed or tilled.

Ar"a*ble, n. Arable land; plow land.

Ar"a*by (&?;), n. The country of Arabia. [Archaic & Poetic]

||Ar`a*ca*nese" (&?;), a. Of or pertaining to Aracan, a province of British Burmah. -- n. sing. & pl. A native or natives of Aracan.

||A`ra*ça"ri (&?;), n. (Zoöl.) A South American bird, of the genus Pleroglossius, allied to the toucans. There are several species.

A*race" (&?;), v. t. [OE. aracen, arasen, OF. arachier, esracier, F. arracher, fr. L. exradicare, eradicare. The prefix a- is perh. due to L. ab. See Eradicate.] To tear up by the roots; to draw away. [Obs.] Wyatt.

A*ra"ceous (&?;), a. [L. arum a genus of plants, fr. Gr. &?;.] (Bot.) Of or pertaining to an order of plants, of which the genus Arum is the type.

A*rach"nid (&?;), n. An arachnidan. Huxley.

||A*rach"ni*da (&?;), n. pl. [NL., fr. Gr. &?; spider.] (Zoöl.) One of the classes of Arthropoda. See Illustration in Appendix.

They have four pairs of legs, no antennæ nor wings, a pair of mandibles, and one pair of maxillæ or palpi. The head is usually consolidated with the thorax. The respiration is either by trancheæ or by pulmonary sacs, or by both. The class includes three principal orders: Araneina, or spiders; Arthrogastra, including scorpions, etc.; and Acarina, or mites and ticks.

A*rach"ni*dan (&?;), n. [Gr. &?; spider.] (Zoöl.) One of the Arachnida.

Ar`ach*nid"i*al (&?;), a. (Zoöl.) (a) Of or pertaining to the Arachnida. (b) Pertaining to the arachnidium.

||Ar`ach*nid"i*um (&?;), n. [NL. See Arachnida.] (Zoöl.) The glandular organ in which the material for the web of spiders is secreted.

||Ar`ach*ni"tis (&?;), n. [Gr. &?; + &?;.] (Med.) Inflammation of the arachnoid membrane.

A*rach"noid (&?;), a. [Gr. &?; like a cobweb; &?; spider, spider's web + &?; form.] 1. Resembling a spider's web; cobweblike.

2. (Anat.) Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.

3. (Bot.) Covered with, or composed of, soft, loose hairs or fibers, so as to resemble a cobweb; cobwebby.

A*rach"noid, n. 1. (Anat.) The arachnoid membrane.

2. (Zoöl.) One of the Arachnoidea.

Ar`ach*noid"al (&?;), a. (Anat.) Pertaining to the arachnoid membrane; arachnoid.

||Ar`ach*noid"e*a (&?;), n. pl. [NL.] (Zoöl.) Same as Arachnida.

A*rach`no*log"ic*al (&?;), a. Of or pertaining to arachnology.

Ar`ach*nol"o*gist (&?;), n. One who is versed in, or studies, arachnology.