Definition from Wiktionary, the free dictionary
Alternative forms 
- donut (North America)
dough + nut, 1809. Originally small, nut-sized balls of fried dough, with the toroidal shape becoming common in the twentieth century. First attested in Knickerbocker’s History of New York, by Washington Irving, 1809.
- IPA: /ˈdəʊnʌt/
- Hyphenation: dough‧nut
doughnut (plural doughnuts)
- A deep-fried piece of dough or batter, commonly of a toroidal (a ring doughnut) often mixed with various sweeteners and flavourings; or flattened sphere (a filled doughnut) shape filled with jam, custard or cream.
- Anything in the shape of a torus.
- (North America) A peel-out or skid mark in the shape of a circle; a 360-degree skid.
- A spare car tyre, usually stored in the boot, that is smaller than a full sized tyre and is only intended for temporary use.
deep-fried piece of dough or batter