/ Dictionary / Index D drop arch: Meaning and Definition of Find definitions for: drop' arch" Pronunciation: [key] a pointed arch having radii of length less than the span. Also calledan arch having a rise of less than half its span. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. drop dropback Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language