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Ostomateostomy
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-- ostracoderm --
Ostracodermi
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ostracoderm
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| n. | 1. | Any of several extinct fishlike jawless vertebrates having a heavily armored body; of the Paleozoic. |
| Noun | 1. |  ostracoderm - extinct fishlike jawless vertebrate having a heavily armored body; of the Paleozoic |