'Doughnut' definitions:

Definition of 'doughnut'

From: WordNet
noun
A toroidal shape; "a ring of ships in the harbor"; "a halo of smoke" [syn: ring, halo, annulus, doughnut, anchor ring]
noun
A small ring-shaped friedcake [syn: doughnut, donut, sinker]

Definition of 'Doughnut'

From: GCIDE
  • Doughnut \Dough"nut\, n. A small cake (usually sweetened) fried in a kettle of boiling lard. [1913 Webster]