Plac″oid (?), a. [Gr. πλάξ, πλακόσ, a tablet + -oid.] (Zoöl.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.