‖Plac′o‐der″mi (?), n. pl. [NL., fr. Gr. πλάξ, πλακόσ, a tablet + δέρμα skin.] (Paleon.) 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.