dystonia

https://doi.org/10.1351/goldbook.11740
State of abnormal (either hypo- or hypertonic) muscle tone resulting in impairment of voluntary movement.
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 864 [Terms] [Paper]