/ Dictionary / Index D diametrical: Meaning and Definition of Find definitions for: di•a•met•ri•cal Pronunciation: (dī"u-me'tri-kul), [key] — adj. of, pertaining to, or along a diameter. in direct opposition; being at opposite extremes; complete: diametrical opposites; a diametrical difference. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diametrical (Thesaurus) diametral diamide Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language