Definition of mayonnaise noun from the Oxford Advanced American Dictionary

 

mayonnaise

 noun
noun
NAmE//ˈmeɪəˌneɪz//
 
, NAmE//ˌmeɪəˈneɪz//
 
(informal mayo
NAmE//ˈmeɪoʊ//
 
)
[uncountable]
 
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a thick, cold, white sauce made from eggs, oil, and vinegar, used to add flavor to sandwiches, salads, etc.
See the Oxford Advanced Learner's Dictionary entry: mayonnaise