Wordnet 3.0
NOUN (1)
1. 
 the tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth; 
[syn: gingiva, gum]
WordNet (r) 3.0 (2006):
gingiva
    n 1: the tissue (covered by mucous membrane) of the jaws that
         surrounds the bases of the teeth [syn: gingiva, gum]