placoid

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plac·oid

 (plăk′oid)
adj.
1. Platelike.
2.
a. Relating to or being a kind of fish scale that is a toothlike plate with a protruding spine, characteristic of sharks, skates, and rays.
b. Having placoid scales.

[Greek plax, plak-, flat stone, plate; see plāk- in Indo-European roots + -oid.]

placoid

(ˈplækɔɪd)
adj
1. (Biology) platelike or flattened
2. (Zoology) (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]

plac•oid

(ˈplæk ɔɪd)

adj.
platelike, as the scales or dermal investments of sharks.
[1835–45; < Greek plak- (s. of pláx) something flat, tablet]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.placoid - as the hard flattened scales of e.g. sharks
planar, two-dimensional - involving two dimensions