placoid Meaning, Definition & Usage

  1. adjective satellite as the hard flattened scales of e.g. sharks
    platelike.

WordNet

Plac"oid adjective
Etymology
Gr. , , a tablet + -oid.
Definitions
  1. (Zoöl.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
Plac"oid noun
Definitions
  1. (Zoöl.) (a) Any fish having placoid scales, as the sharks. (b) One of the Placoides.

Webster 1913