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