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Any of various extinct primitive jawless fishes of the Ordovician through the Devonian periods, having bodies encased in an armor of bony plates.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Palaeontology) any extinct Palaeozoic fishlike jawless vertebrate of the group Ostracodermi, characterized by a heavily armoured body
[C19: via New Latin from Greek ostrakon shell + -derm]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
os•tra•co•derm(ˈɒs trə koʊˌdɜrm)
any of several extinct jawless fishes of the Ordovician to Devonian periods that had the body enclosed in an armor of bony plates.
[1890–95; < New Latin Ostracodermi, pl. of Ostracodermus < Greek ostrakódermos with a shell]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||ostracoderm - extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic|
agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
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