Placoderm

[plækәd:m]

解释:

(noun.) fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws.

录入:维维恩--From WordNet

解释:

(n.) One of the Placodermi.

手打:奥利

解释:

adj. noting an order of fossil fishes having their skin covered with bony plates.

弗洛整理