Wordnet 3.0
NOUN (1)
1. 
 radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; 
 they occur in polyp and medusa forms; 
[syn: coelenterate, cnidarian]
The Collaborative International Dictionary of English v.0.48:
Coelenterate \C[oe]*len"ter*ate\, a. (Zool.)
   Belonging to the C[oe]lentera. -- n. One of the C[oe]lentera.
   [1913 Webster]
WordNet (r) 3.0 (2006):
coelenterate
    n 1: radially symmetrical animals having saclike bodies with
         only one opening and tentacles with stinging structures;
         they occur in polyp and medusa forms [syn: coelenterate,
         cnidarian]