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
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."