Mayonnaise (noun)

1. A thick, creamy sauce made from oil, egg yolks, and vinegar or lemon juice.
2. A cold sauce or dressing typically used for salads and sandwiches.

Origin:

Mid 18th century: from french, from moyeu "egg yolk", from moyau "yolk", from latin medulla "marrow".

Examples:

1. He used mayonnaise to make the sandwich.
2. She added mayonnaise to the potato salad.
3. The mayonnaise recipe requires egg yolks and oil.
4. The mayonnaise is often used as a base for other sauces.
5. The mayonnaise is a versatile condiment that can be used in many dishes.