G&G wrote:
> When we visited wineries in the California wine country, a name was given to
> the clear layer that floats on the top of a glass of wine has a name. What
> is the name of this layer and what is it? We've got bets on it.

If you are talking about the edge of the wine as it touches the glass,
that's known as the meniscus [1], a term that applies to the edge of any
liquid, not just wine and which shares its name with the disc of
cartiliage that separates the bones of the knee.

HTH
Mark Lipton

[1] For you linguistic pedants out there, it's derived from the Greek
name for the crescent moon and is applied to a variety of objects shaped
like the cresecent moon.