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placoid

[plak-oid]

adjective

platelike, as the scales or dermal investments of sharks.

Origin:
1835–45; < Greek plak- (stem of pláx) something flat, tablet + -oid

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Placoid is always a great word to know.

So is ort. Does it mean:

a scrap or morsel of food left at a meal.

a gadget; dingus; thingumbob.

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Collins

World English Dictionary

placoid (ˈplækɔɪd)

—*adj*
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

[C19: from Greek plac-, plax flat]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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placoid

plac·oid