The Collaborative International Dictionary of English v.0.48:

Gustatory \Gust"a*to*ry\, a.
   Pertaining to, or subservient to, the sense of taste; as, the
   gustatory nerve which supplies the front of the tongue.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gustatory
    adj 1: of or relating to gustation [syn: gustatory,
           gustative, gustatorial]