||Arc*tis"ca (&?;), n. pl. [NL., fr. Gr. &?; bear.] (Zoöl.) A group of Arachnida. See Illust. in Appendix.
Arc`to*ge"al (&?;), a. [Gr. &?; the north + &?;, &?;, country.] (Zoöl.) Of or pertaining to arctic lands; as, the arctogeal fauna.
||Arc*toid"e*a (&?;), n. pl. [NL., fr. Gr. &?; bear + -oid.] (Zoöl.) A group of the Carnivora, that includes the bears, weasels, etc.
Arc*tu"rus (&?;), n. [L. Arcturus, Gr. &?; bearward, equiv. to &?;; &?; bear + &?; ward, guard. See Arctic.] (Anat.) A fixed star of the first magnitude in the constellation Boötes.
Arcturus has sometimes been incorrectly used as the name of the constellation, or even of Ursa Major.
Canst thou guide Arcturus with his sons [Rev. Ver.: "the Bear with her train"].
Job xxxviii. 32.
Arc"u*al (&?;), a. Of or pertaining to an arc.
Arcual measure of an angle (Math.), that in which the unit angle has its measuring arc equal to the radius of the circle.
{ Arc"u*ate (&?;), Arc"u*a`ted (&?;)(#), } a. [L. arcuatus, p. p. of arcuare to shape like a bow, fr. arcus. See Arc.] Bent or curved in the form of a bow. "Arcuate stalks." Gray.
Arc"u*ate*ly (&?;), adv. In the form of a bow.
Arc`u*a"tion (&?;), n. [L. arcuatio.] 1. The act of bending or curving; incurvation; the state of being bent; crookedness. Coxe.
2. (Hort.) A mode of propagating trees by bending branches to the ground, and covering the small shoots with earth; layering. Chambers.
Ar"cu*ba*list (&?;), n. [See Arbalist.] A crossbow. Fosbroke.
Ar`cu*bal"ist*er (&?;), n. [L. arcuballistarius. Cf. Arbalister.] A crossbowman; one who used the arcubalist. Camden.