Search Result for "aphthous ulcer":
Wordnet 3.0

NOUN (1)

1. a blister on the mucous membranes of the lips or mouth or gastrointestinal tract; 



WordNet (r) 3.0 (2006):

aphthous ulcer
    n 1: a blister on the mucous membranes of the lips or mouth or
         gastrointestinal tract