a. (Zoöl.) Belonging to the Entomostracans. [ 1913 Webster ]

n. [ Malacostracan + -logy. ] That branch of Zoological science which relates to the crustaceans; -- called also carcinology. [ 1913 Webster ]

a. (Zool.) Belonging to the Malacostraca. [ 1913 Webster ]

n. A member of the Ostracoda, an order of tiny marine and freshwater crustaceans with a shrimplike body enclosed in a bivalve shell.
Syn. -- seed shrimp, mussel shrimp. [ WordNet 1.5 ]

‖prop. n. pl. (Zool.) An order of Entomostraca possessing shrimplike bodies enclosed in hard bivalve shells; called also seed shrimp and mussel shrimp. They were formerly referred to as Ostracoidea. They are of small size, and swim freely about; many are less than 1 mm in length. Microfossils of certain extinct orders have been found extending back to the Cambrian age. [ 1913 Webster +PJC ]

n. Same as ostracod. [ PJC ]

n. Any of several extinct fishlike jawless vertebrates having a heavily armored body; of the Paleozoic. [ WordNet 1.5 ]

‖prop. n. pl. [ NL., fr. Gr. 'o`strakon shell of a testacean + &unr_; skin. ] (Zool.) A suborder of fishes of which Ostracion is the type. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Ostracoidea (now Ostracoda). -- n. One of the Ostracoidea (now Ostracoda). [ 1913 Webster +PJC ]

‖n. pl. [ NL., fr. Gr. 'o`strakon shell of a testacean + -oid. ] (Zool.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about. Now usually written Ostracoda. [ archaic ] [ 1913 Webster +PJC ]