placoderm
/plak-uh-durm/US // ˈplæk əˌdɜrm //UK // (ˈplækəˌdɜːm) //
胎盘,胚胎,胎记,胚胎组织
Definitions
n.名词 noun
- 1
- : any of various extinct jawed fishes of the class Placodermi, dominant in seas and rivers during the Devonian Period and characterized by bony armored plates on the head and upper trunk.
Examples
Placoderm, plak′o-dėrm, adj. noting an order of fossil fishes having their skin covered with bony plates.
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