BIVALENT
Biv"a*lent, a. Etym: [L. bis twice + valens, p. pr. See Valence.]
(Chem.)
Defn: Equivalent in combining or displacing power to two atoms of hydrogen; dyad.
BIVALVE
Bi"valve, n. Etym: [F. bivalve; bi- (L. bis) + valve valve.]
1. (Zoöl.)
Defn: 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.)
Defn: A pericarp in which the seed case opens or splits into two parts or valves.
BIVALVE
Bi"valve, a. Etym: [Pref. bi- + valve.] (Zoöl. & Bot.)
Defn: Having two shells or valves which open and shut, as the oyster and certain seed vessels.
BIVALVED
Bi"valved, a.