mayonnaise /ˈmejəˌneɪz/ noun Learner's definition of MAYONNAISE
[noncount]
1
: a thick, white sauce used especially in salads and on sandwiches and made chiefly of eggs, vegetable oil, and vinegar or lemon juice蛋黄酱
2
British : a food made by mixing something (such as chopped eggs) with mayonnaise用蛋黄酱调制的食物