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Definition of Nevus flammeus
1. Noun. A flat birthmark varying from pink to purple.
Medical Definition of Nevus flammeus
1. Flame nevus, a large congenital vascular nevus having a purplish colour; it is usually found on the head and neck and persists throughout life. See: Sturge-Weber syndrome. Synonym: port-wine mark, port-wine stain. (05 Mar 2000)