(Biv"a*lent) a. [L. bis twice + valens, p. pr. See Valence.] (Chem.) Equivalent in combining or displacing power to two atoms of hydrogen; dyad.

(Bi"valve) n. [F. bivalve; bi- (L. bis) + valve valve.]

1. (Zoöl.) A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, — or by one, as in the oyster. See Mollusca.

2. (Bot.) A pericarp in which the seed case opens or splits into two parts or valves.

(Bi"valve) a. [Pref. bi- + valve.] (Zoöl. & Bot.) Having two shells or valves which open and shut, as the oyster and certain seed vessels.

(Bi"valved) a. Having two valves, as the oyster and some seed pods; bivalve.

(Bi*val"vous) a. Bivalvular.

(Bi*val"vu*lar) a. Having two valves.

(Bi*vault"ed) a. [Pref. bi- + vault.] Having two vaults or arches.

(Bi*vec"tor) n. [Pref. bi- + vector.] (Math.) A term made up of the two parts + 1 -1, where and 1 are vectors.

(Bi*ven"tral) a. [Pref. bi- + ventral.] (Anat.) Having two bellies or protuberances; as, a biventral, or digastric, muscle, or the biventral lobe of the cerebellum.

(Biv"i*al) a. Of or relating to the bivium.

(Biv"i*ous) a. [L. bivius; bis twice + via way.] Having, or leading, two ways.

Bivious theorems and Janus-faced doctrines.
Sir T. Browne.

(||Biv"i*um) n. [L., a place with two ways. See Bivious.] (Zoöl.) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side which includes three ambulacra.

(Biv"ouac) n. [F. bivouac, bivac, prab. fr. G. beiwache, or beiwacht; bei by, near + wachen to watch, wache watch, guard. See By, and Watch.] (Mil.) (a) The watch of a whole army by night, when in danger of surprise or attack. (b) An encampment for the night without tents or covering.

(Biv"ouac), v. i. [imp. & p. p. Bivouacked ; p. pr. & vb. n. Bivouacking.] (Mil.) (a) To watch at night or be on guard, as a whole army. (b) To encamp for the night without tents or covering.

  By PanEris using Melati.

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