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placoid

 - 2 dictionary results

plac⋅oid

  [plak-oid]
Use placoid in a Sentence
–adjective
platelike, as the scales or dermal investments of sharks.
Origin:
1835–45; < Gk plak- (s. of pláx) something flat, tablet + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To placoid
plac·oid   (plāk'oid)   
adj.  Platelike, as the hard toothlike scales of sharks, skates, and rays.

[Greek plax, plak-, flat stone, plate; see plāk-1 in Indo-European roots + -oid.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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