The correct spelling is hors d'oeuvres. (plural)

(In French hors d'oeuvre / hors d'Å“uvre is both singular and plural.)

hors d'oeuvre

(ôr dûrv)

n. pl. hors d'oeuvres (ôr dûrvz) or hors d'oeuvre - An appetizer served before a meal.

[French hors d'uvre : hors, outside + de, of + uvre, (the main) work.]

The French spelling hors d'oeuvre (hors d'Å“uvre) is both singular and plural - the determiner before it tells if it is one (un) or more than one (les).

In English, hors d'oeuvre is singular and hors d'oeuvres is plural.