| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024plac•o•derm (plak′ə dûrm′),USA pronunciation n. - Paleontologyany of various extinct jawed fishes of the class Placodermi, dominant in seas and rivers during the Devonian Period and characterized by bony armored plates on the head and upper trunk.
- Greek; see placoid, -o-) + -dermus -derm
- Neo-Latin Placodermi name of the class, plural of placodermus, equivalent. to placo- (
- 1855–60
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