Definition of Charmat in US English:

Charmat

noun

Winemaking
  • An inexpensive method of producing sparkling wine, by which the wine receives a second fermentation in large tanks rather than (as with champagne) in individual bottles. Chiefly attributive Compare "méthode champenoise".

Origin

1930s; earliest use found in The New York Times. From the name of Eugène Charmat, French chemist who developed such a process 1907.