• (n.) A nervous disease in which the patient involuntarily imitates the words or action of another.
A nervous affection observed in Siberia. ... See: jumping disease. ... Synonym: myriachit. ... (05 Mar 2000) ... 
Mir'ya·chit` noun [ Written also myriachit .] [ Yakoot merjäk epileptic, from imerek jerk, rage.] (Medicine) A nervous disease in which the patient involuntarily imitates the words or action of another. 
Type: Term Pronunciation: mēr-yach′it Definitions: 1. A nervous affliction observed in Siberia. See: jumping disease
myriachit, miryachit A form of bizarre repetitive and widespread habit spasm affecting many members of a community, often in an imitative way. It has been described in Java, Borneo, and in parts of Russia. Etymology: Russian, from Greek myrios, 'countless'.