Definition of maître de chai in English:

maître de chai

(also maître de chais)

noun

Winemaking
  • Chiefly in France, especially Bordeaux: the cellar-master on an estate.

Origin

1950s. From French maître de chai, lit. ‘master of the cellar’ from maître overseer + de + chai, † chais wine storehouse, a western (probably originally Poitevin) form perhaps related to quai.