BEESWING
Etymology
Noun
beeswing (usually uncountable, plural beeswings)
A filmy, translucent crust found in port and other old wines which have been bottled-aged for a long time.
Cream of tartar; potassium bitartrate; the residual salt of tartaric acid.
Anagrams
• beswinge
Source: Wiktionary
Bees"wing`, n.
Definition: The second crust formed in port and some other wines after long
keeping. It consists of pure, shining scales of tartar, supposed to
resemble the wing of a bee.
Source: Webster’s Unabridged Dictionary 1913 Edition