Definition from Wiktionary, the free dictionary
From French gratin
gratin (plural gratins)
- The top crust of a dish, consisting of breadcrumbs or grated cheese heated under a grill; the dish itself.
Derived terms 
- Third-person plural present subjunctive form of gratar.
- Third-person plural imperative form of gratar.
- IPA: /ɡʁa.tɛ̃/
gratin m (plural gratins)