ALL meanings of placoid
plac·oid
P p - adjective placoid platelike, as the scales or dermal investments of sharks. 1
- adjective placoid platelike or flattened 0
- adjective placoid (of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity 0
- adjective placoid of or having scales that are periodically shed and replaced, consisting of a dentin base and an enamel-covered surface, as in cartilaginous fishes 0