'Clypeastroid' definitions:

Definition of 'Clypeastroid'

From: GCIDE

Clypeastroid \Clyp`e*as"troid\, a. [NL. Clypeaster (L. clupeus shield + aster star) + -oid.] (Zool.) Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side. [1913 Webster]