| labial embrasure | A space existing on the facial aspect of the interproximal contact area between adjacent anterior teeth. (05 Mar 2000) |
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| labial flange | The portion of the flange of a denture which occupies the labial vestibule of the mouth. (05 Mar 2000) |
| labial gingiva | That portion of the gingiva that covers the labial surfaces of the teeth and the alveolar process. (05 Mar 2000) |
| labial glands | Mucous glands in the submucous tissue of the lips. Synonym: glandulae labiales. (05 Mar 2000) |
| labial hernia | Hernia through the canal of Nuck. (05 Mar 2000) |
| labial occlusion | Malposition of a tooth in a labial direction, the occlusion as seen from the labial side of the arches. (05 Mar 2000) |
| labial splint | An appliance of plastic, metal, or in combination, made to conform to the outer aspect of the dental arch and used in the management of jaw and facial injuries. (05 Mar 2000) |
| labial sulcus | A furrow between the developing lip and gum. Synonym: labiodental sulcus, lip sulcus, primary labial groove. (05 Mar 2000) |
| labial surface | The surface of a tooth that faces the buccal or labial mucosa of vestibule of the mouth; opposite to the lingual surface of tooth. Synonym: facies vestibularis dentis, facies facialis dentis, buccal surface, facial surface of tooth, facies buccalis, facies labialis, labial surface. (05 Mar 2000) |
| labial tubercle | The slight projection on the free edge of the centre of the upper lip at the lower extent of the philtrum. Synonym: tuberculum labii superioris, procheilon, prochilon, tubercle of upper lip. (05 Mar 2000) |
| labial veins | See: anterior labial veins, posterior labial veins, inferior labial vein, superior labial vein. (05 Mar 2000) |
| labial vestibule | That part of the oval vestibule related to the lips. (05 Mar 2000) |
| abdominal part of aorta | <anatomy> The largest arterial conduit below the diaphragm. This term refers to the portion of the aorta below the diaphragm to the bifurcation into the right and left common iliac arteries. It supplies blood to the abdominal viscera, pelvic organs and lower extremities. (20 Jun 2000) |
| abdominal part of oesophagus | The part of the oesophagus inferior to the diaphragm. See: oesophagus. Synonym: pars abdominalis oesophagi. (05 Mar 2000) |
| abdominal part of thoracic duct | The part of the thoracic duct between the cisterna chyli and the aortic hiatus of the diaphragm. Synonym: pars abdominalis ductus thoracici. (05 Mar 2000) |