Defn: (Anat.) Having two bellies or protuberances; as, a biventral, or digastric, muscle, or the biventral lobe of the cerebellum.
BIVIAL
Biv"i*al, a.
Defn: Of or relating to the bivium.
BIVIOUS
Biv"i*ous, a. Etym: [L. bivius; bis twice + via way.]
Defn: Having, or leading, two ways.
Bivious theorems and Janus-faced doctrines. Sir T. Browne.
BIVIUM
Biv"i*um, n. Etym: [L., a place with two ways. See Bivious.] (Zoöl.)
Defn: One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
BIVOUAC Biv"ouac, n. Etym: [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.
BIVOUAC 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.
BIWEEKLY
Bi"week`ly, a. Etym: [Pref. bi- + weekly.]