Definition of placoderm Placoderm

plac•o•derm

We found 5 definitions of placoderm from 5 different sources.

What does placoderm mean?

WordNet

Noun

Plural: placoderms

placoderm - fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws

aquatic vertebrate animal living wholly or chiefly in or on water

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Wiktionary

placoderm (Noun)
A member of an extinct group of fish with armored heads; the group lived during the Silurian and Devonian periods.

Webster DictionaryWebster's Unabridged Dictionary 📘

placoderm (n.)
One of the Placodermi.

Chambers DictionaryChamber's 20th Century Dictionary 📕

placoderm
plak′o-dėrm, adj. noting an order of fossil fishes having their skin covered with bony plates. [Gr. plax, plakos, anything flat, derma, skin.]