| ostracoderm | (n) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic |
| ostracodermi | (n) extinct group of armored jawless vertebrates; taxonomy is not clear, Syn. order Ostracodermi |
| ostracoderm | n. Any of several extinct fishlike jawless vertebrates having a heavily armored body; of the Paleozoic. [ WordNet 1.5 ] |
| Ostracodermi | ‖prop. n. pl. [ NL., fr. Gr. |