/ Dictionary / Index A acrasin: Meaning and Definition of Find definitions for: a•cra•sin Pronunciation: (u-krā'sin), [key] — n. Mycol. a chemotactic substance, identical with cAMP, secreted by myxamebas of cellular slime molds and attracting other myxamebas to aggregate and form a pseudoplasmodium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acraldehyde acre Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language