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placoid

[plak-oid] /ˈplæk ɔɪd/
adjective
1.
platelike, as the scales or dermal investments of sharks.
Origin
1835-1845
1835-45; < Greek plak- (stem of pláx) something flat, tablet + -oid
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for placoid

placoid

/ˈplækɔɪd/
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
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
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