Source : Webster's Revised Unabridged Dictionary (1913)

Buccal \Buc"cal\, a. [L. bucca cheek: cf. F. buccal.] (Anat.)
   Of or pertaining to the mouth or cheeks.

Source : WordNet®

buccal
     adj 1: of or relating to or toward the cheek
     2: lying within the mouth; "a buccal gland"
     3: toward the inside of the cheek; "the buccal aspect of the
        gum"