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Definition of Blue spot
1. Noun. (snooker) The spot on a snooker table where the blue ball is normally placed. ¹
¹ Source: wiktionary.com
Medical Definition of Blue spot
1. A bluish stain on the skin caused by the bites of fleas or lice, especially pediculosis pubis. Synonym: blue spot, tache bleuatre. (05 Mar 2000)