| 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) |
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| 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) |