Definition of au gratin in English:

au gratin

Syllabification: au grat·in
Pronunciation: /ˌō ˈgrätn, ˈgratn, graˈtaN
 
/

adjective

[predic.]
Sprinkled with breadcrumbs or grated cheese, or both, and browned: lentils and mushrooms au gratin
More example sentences
  • I used to do a potato au gratin with mushrooms which I really like.
  • These are the traditional components of potatoes au gratin.

Origin

early 19th century: French, literally 'by grating'.

Definition of au gratin in:

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Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily