The Collaborative International Dictionary
Clypeastroid
Clypeastroid \Clyp`e*as"troid\, a. [NL. Clypeaster (L. clupeus shield + aster star) + -oid.] (Zo["o]l.) Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side.
Wiktionary
clypeastroid
a. (context zoology English) Like or related to the genus (taxlink Clypeaster genus) of flattened sea urchins, with a rosette of pores on the upper side.