Definitions for placodermi
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Princeton's WordNet
Placodermi, class Placodermi(noun)
extinct group of bony-plated fishes with primitive jaws
Webster Dictionary
Placodermi(u)
an extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus
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