/ Dictionary / Index D decussation: Meaning and Definition of Find definitions for: de•cus•sa•tion Pronunciation: (dē"ku-sā'shun, dek"u-), [key] — n. a process of becoming or condition of being crossed in the form of an a nerve or tract of nerve fibers that crosses from one side of the central nervous system to the other. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decussation (Thesaurus) decussate decyl Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language