noun
Meaning 1
The normally sharp demarcation between the lip (red-coloured) and the adjacent normal skin, representing the change in the epidermis from highly keratinized external skin to less keratinized internal skin.
Definition source: English Wiktionary via Wiktextract
Topics: anatomy, medicine, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided