Adjacent Words

placoid definitions

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WordNet (r) 3.0 (2005)

adj
1: as the hard flattened scales of e.g. sharks [syn: placoid, platelike]

Merriam Webster's

adjective Etymology: Greek plak-, plax flat surface Date: 1842 of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs

Oxford Reference Dictionary

adj. & n. --adj. 1 (of a fish-scale) consisting of a hard base embedded in the skin and a spiny backward projection (cf. CTENOID). 2 (of a fish) covered with these scales. --n. a placoid fish, e.g. a shark. Etymology: Gk plax plakos flat plate

Webster's 1913 Dictionary

Placoid Plac"oid, a. [Gr. ?, ?, a tablet + -oid.] (Zo["o]l.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.

Webster's 1913 Dictionary

Placoid Plac"oid, n. (Zo["o]l.) (a) Any fish having placoid scales, as the sharks. (b) One of the Placoides.