Acephala
(n. pl.) That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.
Similar Words:
Acephal Acephala Acephalan Acephali Acephalist Acephalocyst Acephalocystic Acephalous Megacephalic Megacephalous