Main Entry: port–wine stain Pronunciation: 'port-"wIn- Function: noun : a reddish purple superficial hemangioma of the skin commonly occurring as abirthmark called also nevus flammeus,port-wine mark
port-wine stainn. A purplish area of the skin, usually on the head and neck, appearing at birth and caused by an overgrowth of the cutaneous capillaries. Also called nevus flammeus, port-wine mark.