spatangoidea Meaning, Definition & Usage

Spat`an*goi"de*a noun plural

Etymology

NL. See Spatangus, and -oid.

Definitions

1. (Zoöl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side.