/ Dictionary / Index G Grimsby: Meaning and Definition of Find definitions for: Grims•by Pronunciation: (grimz'bē), [key] — n. a seaport in Humberside county, in E England at the mouth of the Humber estuary. 93,800. a town in SE Ontario, in S Canada, on the SW shore of Lake Ontario. 15,797. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Grim Reaper grimy Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language