/ Dictionary / Index O Onega: Meaning and Definition of Find definitions for: O•ne•ga Pronunciation: (ō-neg'u Russ. u-nye'gu), [key] — n. a lake in the NW Russian Federation in Europe: second largest lake in Europe. 3764 sq. mi. (9750 sq. km). a river in the NW Russian Federation in Europe, flowing N to Onega Bay. 250 mi. (405 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: onega (Thesaurus) onefold Onega Bay Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language