ostracoderm

os·tra·co·derm

O0144950 (ŏs′trə-kŏ-dûrm′)n. Any of various extinct primitive jawless fishes of the Ordovician through the Devonian periods, having bodies encased in an armor of bony plates.

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

ostracoderm

(ˈɒstrəkəˌdɜːm; ɒsˈtrækə-) n (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]

os•tra•co•derm

(ˈɒs trə koʊˌdɜrm)

n. 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]

Thesaurus

Noun

1.

ostracoderm - extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoicagnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct formsorder Ostracodermi, Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clear