miryachit
/mɪrɪˈɑːtʃɪt/(also myriachit) Psychiatry. Now historical
noun
A syndrome characterized by echolalia and echopraxia in response to a sudden stimulus, observed in Siberia and variously regarded as a psychiatric disorder or as an exaggerated or abnormal startle response.
Origin
Late 19th century. From Russian regional (Siberia) mirjačit (also transliterated miryachit), 3rd person singular of mirjačit′ to have the falling sickness, lit. ‘to be possessed by an evil spirit’ from mirjak evil spirit, later extended to mean ‘person with miryachit’.