Source : Webster's Revised Unabridged Dictionary (1913)

Coelenterate \C[oe]*len"ter*ate\, a. (Zo["o]l.)
   Belonging to the C[oe]lentera. -- n. One of the C[oe]lentera.

Source : WordNet®

coelenterate
     n : radially symmetrical animals having saclike bodies with only
         one opening and tentacles with stinging structures; they
         occur in polyp and medusa forms [syn: {cnidarian}]