/ Dictionary / Index M mercerize: Meaning and Definition of Find definitions for: mer•cer•ize Pronunciation: (mûr'su-rīz"), [key] — -ized, -iz•ing. to treat (cotton yarns or fabric) with caustic alkali under tension, in order to increase strength, luster, and affinity for dye. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mercerize (Thesaurus) Mercer Island mercery Related Content Daily Word Quiz: vernacular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language