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  1. platelike, as the scales or dermal investments of sharks.
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Origin of placoid

1835–45; < Greek plak- (stem of pláx) something flat, tablet + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for placoid


  1. platelike or flattened
  2. (of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity
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Word Origin

C19: from Greek plac-, plax flat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012