Pronunciation IPA (key): /ˈmeɪ.ə.neɪz/ or /ˌmeɪ.əˈneɪz/ (US) IPA (key): /ˈmæn.eɪz/ or [ˈmɛən-] Audio (US)(file) Noun Singular mayonnaise Plural none Mayonnaise is a condiment. It is often used as a spread or a dressing. It is made of eggs, oil and vinegar or lemon juice. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads