/ Dictionary / Index L longi-: Meaning and Definition of Find definitions for: longi- Pronunciation: [key] a combining form meaning “long,” used in the formation of compound words: longicorn. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. long hundredweight longicaudal Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language