1939, French, in full crême vichyssoise glacée, literally "iced cream (soup) of Vichy" (see Vichy).
Entries linking to vichyssoise
Vichy adj.
in reference to collaborationist government of France, 1940, from the name of the city in department of Allier in central France, famous for mineral springs, seat 1940-44 of the French government formed under Nazi occupation and headed by Pétain. The place name is of uncertain origin.