ostracoderm

/os-truh-koh-durm/US // ˈɒs trə koʊˌdɜrm //UK // (ˈɒstrəkəˌdɜːm, ɒsˈtrækə-) //

排泄物,表皮细胞,腹腔镜,腹腔镜手术

Definitions

n.名词 noun

1
- : any of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates.