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Definition of Clypeastroid
1. a. Like or related to the genus Clupeaster; -- applied to a group of flattened sea urchins, with a rosette of pores on the upper side.
Definition of Clypeastroid
1. Adjective. (zoology) Like or related to the genus ''Clypeaster'' of flattened sea urchins, with a rosette of pores on the upper side. ¹
¹ Source: wiktionary.com