coriaˈmyrtinChem. [f.Coria(ria myrt(ifolia + -in.] A crystalline, bitter, poisonous glycoside obtained from the fruit and leaves of Coriaria myrtifolia. Called also coriarin. 1868–77Watts Dict.Chem. V. 1090 Coriamyrtin is a white, bitter, very poisonous substance.