| spatangoida | (n) heart-shaped sea urchins, Syn. order Spatangoida |
| Spatangoid | a. (Zool.) Of or pertaining to the |
| Spatangoidea | ‖n. pl. [ NL. See Spatangus, and -oid. ] (Zool.) 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. [ 1913 Webster ] |