Etymology
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chorea (n.)

"nervous disease marked by irregular and involuntary motions," 1806, from Modern Latin chorea Sancti Viti "St. Vitus dance" (1620s) which originally was a mass hysteria prevalent in 15c. Europe characterized by uncontrolled dancing); from Latin chorea "a dance," from Greek khoreia "dance" (see chorus). Related: Choreal.

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Definitions of chorea

chorea (n.)
chorea in dogs;
Synonyms: canine chorea
chorea (n.)
any of several degenerative nervous disorders characterized by spasmodic movements of the body and limbs;
From wordnet.princeton.edu