paratonia
/ˌparəˈtəʊnɪə/Medicine
noun
Muscle spasm or rigidity; (in later use) specifically muscle rigidity occurring in resistance to, or as failure of relaxation after, passive movement, seen especially in disorders of the cerebral cortex.
Origin
Mid 19th century; earliest use found in Robley Dunglison (1798–1869), physician and medical writer. From para- + -tonia. In specific use after French paratonie.