[doh-nuht, -nuht]
a small cake of sweetened or, sometimes, unsweetened dough fried in deep fat, typically shaped like a ring or, when prepared with a filling, a ball.
anything shaped like a thick ring; an annular object; toroid.
Also, donut.

1795–1805; dough + nut Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doughnut or esp (US) donut (ˈdəʊnʌt)
1.  a small cake of sweetened dough, often ring-shaped or spherical with a jam or cream filling, cooked in hot fat
2.  anything shaped like a ring, such as the reaction vessel of a thermonuclear reactor
vb , -nuts, -nutting, -nutted
3.  informal (tr) (of Members of Parliament) to surround (a speaker) during the televising of Parliament to give the impression that the chamber is crowded or the speaker is well supported
donut or esp (US) donut

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1809, Amer.Eng., from dough + nut. First recorded by Washington Irving, who described them as "balls of sweetened dough, fried in hog's fat, and called doughnuts, or olykoeks."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Axel begins feeding ingredients into the sausage-mixing machine's doughnut-shaped trough.
Instead, the new doughnut-shaped silicon detectors rely on measuring light frequency.
There is no need for dark energy, gravity folds space into what could be
  imagined as a doughnut with a singularity at the center.
Maybe it's the floor where elevators don't stop, or the doughnut that bakers
  don't count.
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