/ Dictionary / Index A algin: Meaning and Definition of Find definitions for: al•gin Pronunciation: (al'jin), [key] — n. Chem. any hydrophilic, colloidal substance found in or obtained from various kelps, as alginic acid or one of its soluble salts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: algin (Thesaurus) Algiers alginate Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language