Breadcrumb Home > Dictionary > Index D diacritical: Meaning and Definition of Find definitions for: di•a•crit•i•cal Pronunciation: (dī"u-krit'i-kul), [key] — adj. serving to distinguish; distinctive. capable of distinguishing. serving as a diacritic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diacritical (Thesaurus) diacritic diactinic ✖ Related Content Daily Word Quiz: prandial Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language