• WordNet 3.6
    • n ostracoderm extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic
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Century Dictionary and Cyclopedia
    • ostracoderm Having a bony skin like a coat of mail; ostraciont, as a fish; pertaining to the Ostracodermi. Also ostracodermal, ostracodermous.
    • n ostracoderm An ostraciont fish, as a member of the Ostracodermi; a plectognath of the suborder Ostracodermi.
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In literature:

The first generation was a group of strange creatures, half fish and half Crustacean, which are known as the Ostracoderms.
"The Story of Evolution" by Joseph McCabe