Breadcrumb Home > Dictionary > Index A actomyosin: Meaning and Definition of Find definitions for: ac•to•my•o•sin Pronunciation: (ak"tu-mī'u-sin), [key] — n. Biochem. a complex protein, consisting of myosin and actin, that is the major constituent of skeletal muscle and is thought to interact with ATP to cause muscle contraction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: actomyosin (Thesaurus) act of war acton TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language