/ Dictionary / Index D diaphragmatic: Meaning and Definition of Find definitions for: di•a•phrag•mat•ic Pronunciation: (dī"u-frag-mat'ik), [key] — adj. of the diaphragm. like a diaphragm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diaphragm diaphragm shutter Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language