/ Dictionary / Index D diapedesis: Meaning and Definition of Find definitions for: di•a•pe•de•sis Pronunciation: (dī"u-pi-dē'sis), [key] — n. Physiol. the passage of blood cells, esp. leukocytes, through the unruptured walls of the capillaries into the tissues. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diapedesis (Thesaurus) diapause diaper 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