Having two shells or valves which open and shut given that oyster and specific seed vessels
- A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament on hinge which is frequently strengthened by prominences known as teeth The layer is closed because of the contraction of two transverse muscle tissue connected to the inner area like in the clam or by one as in the oyster See Mollusca
- utilized of mollusks having two shells (as clams etc.)
- marine or freshwater mollusks having a soft human body with platelike gills enclosed within two shells hinged together
- A mollusk having a shell consisting of two lateral plates or valves joined up with together by an elastic ligament at hinge, which can be generally strengthened by prominences known as teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as with the clam, -- or by one, such as the oyster. See Mollusca.
- A pericarp in which the seed situation opens or splits into two components or valves.
- Having two shells or valves which open-and-shut, as the oyster and specific seed vessels.
1660s in reference to mollusks with double shells; 1670s in reference to shutters or doorways; from bi- + device. The noun is 1680s in the mollusk sense.
(letter.) A pericarp where the seed case opens or splits into two parts or valves.
- (a.) Having two shells or valves which open and shut, as the oyster and specific seed vessels.
The males are usually more brilliantly coloured than the females, and guard the eggs, which are often placed in a sort of nest made of the shell of some bivalve or of the carapace of a crab, with the convexity turned upwards and FIG.