/ Dictionary / Index E elastin: Meaning and Definition of Find definitions for: e•las•tin Pronunciation: (i-las'tin), [key] — n. Biochem. a protein constituting the basic substance of elastic tissue. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: elastin (Thesaurus) elastic wave elastomer 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