Spatangoidea
Pronunciation : Spat`an*goi"de*a
Part of Speech : n.
Etymology : [NL. See Spatangus, and -oid.] (Zo?l.)
Definition : Defn: 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.
pl.
Source : Webster's Unabridged Dictionary, 1913