Definition of hors d'oeuvre?

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.]

It's a variety of appetisers served before a meal.

They are the small appetizers served before the entree of a meal.

It does not need capitalizing, as it translates as appetizer.

You are probably refering to "crudités" and "charcuterie"; the first being vegetable preparations and the latter being meat based, usually porc (pâté, salami etc...) Just as a bit of useless info...