Definitions for ostracodermˈɒs trə koʊˌdɜrm
Random House Webster's College Dictionary
os•tra•co•dermˈɒs 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.
Origin of ostracoderm:
1890–95; < NL Ostracodermi, pl. of Ostracodermus < Gk ostrakódermos with a shell
extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic