/ Dictionary / Index D developable surface: Meaning and Definition of Find definitions for: devel'opable sur'face Pronunciation: [key] — Math. Math. a surface that can be flattened onto a plane without stretching or compressing any part of it, as a circular cone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. develop developer Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language