beeswing


beeswing
noun /ˈbiːzwɪŋ/
a filmy, translucent crust found in port and other old wines which have been bottled-aged for a long time

, 1904: The three glasses were grouped together, all of them tinged with wine, and one of them containing some dregs of beeswing. — Arthur Conan Doyle, ‘The Adventure of the Abbey Grange’ (Norton 2005, p.1170)


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