The Collaborative International Dictionary of English v.0.48:

Chorea \Cho*re"a\ n. [NL., fr. Gr. ? dance.] (Med.)
   St. Vitus's dance; a disease attended with convulsive
   twitchings and other involuntary movements of the muscles or
   limbs.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chorea
    n 1: chorea in dogs [syn: canine chorea, chorea]
    2: any of several degenerative nervous disorders characterized
       by spasmodic movements of the body and limbs

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "chorea":
   MS, ague, amyotrophic lateral sclerosis, brain disease, bumpiness,
   cephalalgia, cerebral palsy, chattering, cold shivers,
   emotional disorder, epilepsy, falling sickness, fits and starts,
   glossopharyngeal neuralgia, headache, herpes zoster, ischialgia,
   jactation, jactitation, jerkiness, joltiness, migraine,
   multiple sclerosis, nervous disorder, neuralgia, neuritis,
   neuropathy, organic psychosis, palsy, polyneuritis,
   pressure neuropathy, priapism, quaking, quavering, quivering,
   radiculitis, sciatic neuritis, sciatica, shakes, shaking,
   shaking palsy, shingles, shivering, shivers, shuddering, spasms,
   spastic paralysis, succussion, the jerks, tic douloureux,
   toxic psychosis, trembling, tremulousness, vibration