A bottle of salad dressing.
salad dressing definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a preparation of olive oil or other vegetable oil, vinegar, spices, etc. served with a salad
salad dressing definition by American Heritage Dictionary
A sauce, such as one made of mayonnaise or of oil and vinegar, that is served on salad.