Placoderm Definition
plăkə-dûrm
noun
Any of various extinct jawed fishes of the group Placodermi of the Silurian and Devonian Periods, having bony plates of armor covering the head and thorax. Placoderms were among the first jawed vertebrates.
American Heritage
Other Word Forms of Placoderm
Noun
Singular:
placoderm
Plural:
placodermsOrigin of Placoderm
-
New Latin Placodermī class name Greek plax plak- flat stone, plate plāk-1 in Indo-European roots –derm
From American Heritage Dictionary of the English Language, 5th Edition
Find Similar Words
Find similar words to placoderm using the buttons below.