port wine stain
noun/ˌpɔːt ˈwaɪn steɪn/
/ˌpɔːrt ˈwaɪn steɪn/
- a large, dark red birthmark (= a mark that somebody is born with on their skin)
- a port wine stain, present at birth
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port wine stain
Definition of port wine stain noun from the Oxford Advanced Learner's Dictionary