Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various extinct primitive jawless fishes of the Ordovician through the Devonian periods, having bodies encased in an armor of bony plates.

from The Century Dictionary.

  • Having a bony skin like a coat of mail; ostraciont, as a fish; pertaining to the Ostracodermi. Also ostracodermal, ostracodermous.
  • noun An ostraciont fish, as a member of the Ostracodermi; a plectognath of the suborder Ostracodermi.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Any of several extinct fishlike jawless vertebrates having a heavily armored body; of the Paleozoic.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek ostrakon, shell; see ost- in Indo-European roots + –derm.]

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