Adieux

Carroll & Graf Publishers, Inc., 1992, p. 473. Also see Simone De Beauvoir, Adieux: A Farewell to Sartre.

If the x is not pronounced, then in the absence of special rulings the plurals are formed with an apostrophe followed by an s: the beaux’s appearance; the bureaux’s responses; their adieux’s effect was that everyone wept.

Nouns borrowed from French ending in -eau, -eu, -au, or -ou sometimes have alternative plurals that retain the French -x: beaux or beaus; bureaux or bureaus; adieux or adieus; fabliaux or fabliaus; choux or chous.