orthochorea or·tho·cho·re·a (ôr’thō-kô-rē’ə, -kə-)
A form of chorea in which the spasms occur chiefly when the patient is in an erect posture.


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    [awr-thuh-klas-tik] /ˌɔr θəˈklæs tɪk/ adjective, Crystallography. 1. (of a crystal) having cleavages at right angles to each other.

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