Correct spelling for the English word "myurous" is [mjˈuːɹəs], [mjˈuːɹəs], [m_j_ˈuː_ɹ_ə_s] (IPA phonetic alphabet).
Gradually decreasing, as a mouse's tail, in thickness; noting certain symptoms in process of cessation, and also the heart-beat in certain cases in which it grows feebler and feebler for a while and then strengthens.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.