Placoid

a.	1.	(Zool.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
n.	1.	(Zool.) Any fish having placoid scales, as the sharks.

Adj.

1.

placoid - as the hard flattened scales of e.g. sharks Synonyms: platelike

planar, platelike, two-dimensional