Definition of au gratin in English:

au gratin

Pronunciation /ō ˈɡratan//ˌō ˈɡrätn/

adjective

  • [predicative] Sprinkled with breadcrumbs or grated cheese, or both, and browned.

    ‘lentils and mushrooms au gratin’
    • ‘These are the traditional components of potatoes au gratin.’
    • ‘I used to do a potato au gratin with mushrooms which I really like.’

Origin

Early 19th century: French, literally by grating.

Pronunciation

au gratin

/ō ˈɡratan//ˌō ˈɡrätn/