I. ˈplaˌkȯid adjective
Etymology: plac- + -oid
1. : consisting of a basal plate of dentine of dermal origin embedded in the skin and bearing a projecting point or spine tipped with enamel — used of an elasmobranch fish scale; compare shagreen
2.
[New Latin Placoidei ]
: of or relating to the Placoidei
II. noun
( -s )
Etymology: New Latin Placoidei
: a fish of the group Placoidei