n. a filmy, translucent crust found in port and other old wines which have been bottled-aged for a long time
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. A gauzy film in port and some other wines, indicative of age; hence, sometimes, the wine itself. Also written bee's-wing.
Word Usage
""beeswing" sherry, he was aware of all Alan Hawke's intentions."