vinaigrette dressing (or sauce)

noun

1. a small ornamental box or bottle with a perforated lid, used for holding aromatic vinegar, smelling salts, etc.
2. a blend of vinegar, oil, herbs, etc. used as a salad dressing or as a sauce on cold meats or fish
   also called vinaigrette dressing (or sauce)

Origin: Fr < vinaigre, vinegar