1) Chorea 
A form of chorea in which the spasms occur only or chiefly when the patient is in the erect posture. ... (05 Mar 2000) ... 
(or″tho-kә-re´ә) choreic movements in the erect posture.
[n] - a form of chorea in which spasms occur mainly when the patient is erect
orthochorea 1. A form of chorea (disease characterized by progressive loss of neuronal functioning) in which the spasms occur only, or chiefly, when the patient is an erect posture. 2. A form of random involuntary movement generally involving the hands and feet that occurs only when the person is standing up.
noun a form of chorea in which spasms occur mainly when the patient is erect