Definition of: oyster

(ois′tər) noun
1. Any of various marine mollusks of the family Ostreidae having a rough, unequal bivalve shell closed by a single adductor muscle and attached to stones, shells, etc., on the bottom, including species cultivated for food.
2. The morsel of dark meat found in the hollow of the bone on both sides of a fowl.
3. Some delicacy; titbit; prize.
4. Slang A very uncommunicative person.
—v.i. To gather or cultivate oysters. [<OF oistre <L ostrea <Gk. ostreon]
OYSTER
a. Shell.
b Hinge.
c. Mantle.
d. Palpi.
e. Anus.
f. Liver.
g. Heart.
h. Adductor.
i. Stomach.
j. Gills.