/ Dictionary / Index D dechlorinate: Meaning and Definition of Find definitions for: de•chlo•ri•nate Pronunciation: (dē-klôr'u-nāt", -klōr'-), [key] — -at•ed, -at•ing. to remove the chlorine from (a substance, as water): to dechlorinate tap water for use in an aquarium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dechlorinate (Thesaurus) decertify deci- Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language