When you say 'mayonnaise' are you speaking French?

'Mayonnaise' is a word borrowed from French 'mahonnais'. The word entered the English language some time around 1841.

mayonnaise [noun] [1841]

A dressing made chiefly of egg yolks, vegetable oils, and vinegar or lemon juice

See 'mayonnaise' on the Loan Words Map

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note: French probably from the feminine of mahonnais ‘of or from Port Mahon’ the capital of Minorca.
Etymology: French

See more loan words from 1800s.