placoid

[plak-oid]

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

Examples from the Web for placoid

Historical Examples of placoid


British Dictionary definitions for placoid

placoid

adjective
  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

Word Origin for placoid

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