/ Dictionary / Index D dropper-in: Meaning and Definition of Find definitions for: drop•per-in Pronunciation: (drop'ur-in'), [key] — pl. drop•pers-in. drop-in (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dropper dropping Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language