/ Dictionary / Index O Onitsha: Meaning and Definition of Find definitions for: O•nit•sha Pronunciation: (ō-nich'u), [key] — n. a city in SW Nigeria, on the Niger River. 220,000. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. onionskin -onium Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language