/ Dictionary / Index D downcomer: Meaning and Definition of Find definitions for: down•com•er Pronunciation: (doun'kum"ur), [key] — n. a pipe, tube, or passage for conducting fluid materials downward. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. downcome downcourt Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language