The Collaborative International Dictionary of English v.0.48:

Glossa \Glos"sa\, n.; pl. Gloss[ae]. [NL., fr. Gr. ? the
   tongue.] (Zool.)
   The tongue, or lingua, of an insect. See Hymenoptera.
   [1913 Webster]

WordNet (r) 3.0 (2006):

glossa
    n 1: a mobile mass of muscular tissue covered with mucous
         membrane and located in the oral cavity [syn: tongue,
         lingua, glossa, clapper]