Definition from Wiktionary, the free dictionary
buccal (not comparable)
- Of or relating to the cheek or, more rarely, the mouth.
- (dentistry, of a premolar or molar) On the side facing the cheek.
- (medicine, of a drug) Administered in the mouth, not by swallowing but by absorption through the skin of the cheek; often by placing between the top gum and the inside of the lip.
- (of a tooth): mesial
Coordinate terms 
- (dentistry location adjectives) anterior, apical, axial, buccal, cervical, coronal, distal, distobuccal, distofacial, distoincisal, distolingual, facial, gingival, incisal, inferior, labial, lingual, mandibular, maxillary, mesial, mesiobuccal, mesiodistal, mesiofacial, mesioincisal, mesiolingual, occlusal, palatal, posterior, proximal, superior, vestibular (Category: en:Dentistry)