/ Dictionary / Index C Calgon: Meaning and Definition of Find definitions for: Cal•gon Pronunciation: (kal'gon), [key] — Trademark. Trademark. a brand of sodium phosphate glasssoluble in water: used as a water-softening agent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Calgary redeye Calhoun 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