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Abnormal tonicity of muscle, characterized by prolonged, repetitive muscle contractions that may cause twisting or jerking movements of the body or a body part.
dys·ton′ic (-tŏn′ĭk) adj.
(Pathology) a neurological disorder, caused by disease of the basal ganglia, in which the muscles of the trunk, shoulders, and neck go into spasm, so that the head and limbs are held in unnatural positions
[from dys- + -tonia from Greek tonos tension, from teinen to stretch]
dys•to•ni•a(dɪsˈtoʊ ni ə)
a neurological disorder marked by strong involuntary muscle spasms that cause painful and disabling twisting of the body.
dys•ton•ic (-ˈtɒn ɪk) adj.
n. distonía, tonicidad alterada, esp. muscular.