amyosthenicMed.|əmaɪəsˈθɛnɪk| [f.mod.L. amȳosthenīa want of muscular power (f.Gr. ἀ priv. + µῦς, µυ-ός muscle + -σθενεια strength) + -ic.] A medicine which depresses muscular action. 1879Syd. Soc.Lex.s.v., Divisible into general and special amyosthenics; to the former belong belladonna, opium, etc.