
1) Cramp 2) Medical sign 3) Muscle spasm 4) Spasm
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https://www.crosswordclues.com/clue/myoclonus

Myoclonus s or s is a brief, involuntary twitching of a muscle or a group of muscles. It describes a medical sign and, generally, is not a diagnosis of a disease. These myoclonic twitches, jerks, or seizures are usually caused by sudden muscle contractions (positive myoclonus) or brief lapses of contraction (negative myoclonus). The most common ci...
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http://en.wikipedia.org/wiki/Myoclonus

(from the article `nervous system disease`) Brief, involuntary jerks of the trunk and of the limbs may occur in spinal myoclonus. Many diffuse, metabolic, or local structural causes of ...
Found on
http://www.britannica.com/eb/a-z/m/147

Sudden abnormal twitching of muscles or muscle groups without any rhythm that occurs with brain disorders.
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http://www.buylowdrugs.com/pharmacy-articles/Glossary-of-Common-Medical-Ter

Twitching or spasm of a muscle or a group of muscles. ... (27 Sep 1997) ...
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http://www.encyclo.co.uk/local/20973

(mi-ok´lo-nәs) shocklike contractions of part of a muscle, an entire muscle, or a group of muscles; usually a manifestation of a convulsive disorder. adj., myoclon´ic., adj. palatal myoclonus a condition characterized by a rapid rhythmic movement of one or both sides ...
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http://www.encyclo.co.uk/local/21001

abrupt, jerking movements of the arms or legs, commonly occurring during sleep and benign, but could be a separate movement disorder.
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http://www.encyclo.co.uk/local/21811

Sudden, involuntary jerking or twitching of a muscle or group of muscles
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http://www.encyclo.co.uk/local/22236

Jerking, involuntary movement of arms and legs, usually occurring during sleep.
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http://www.encyclo.co.uk/visitor-contributions.php

A brief twitching muscular spasm.
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http://www.gadsbywicks.co.uk/uploaded/3822.pdf

Type: Term Pronunciation: mī-ok′lō-nŭs, mī-ō-klo′nŭs Definitions: 1. One or a series of shocklike contractions of a group of muscles, of variable regularity, synchrony, and symmetry, generally due to a central nervous system lesion.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=58403

Myoclonus: A condition of abnormal contraction of muscles or portions of muscles.
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http://www.medterms.com/script/main/art.asp?articlekey=4488

Involuntary rapid, jerky twitching or contraction of muscles.
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http://www.thehorse.com/Glossary.xhtml?L=M

[
n] - a clonic spasm of a muscle or muscle group
Found on
http://www.webdictionary.co.uk/definition.php?query=myoclonus
noun a clonic spasm of a muscle or muscle group
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https://www.encyclo.co.uk/local/20974

an abrupt spasm or twitch of a muscle or group of muscles, occurring in some neurological diseases.
Found on
https://www.infoplease.com/dictionary/myoclonus
No exact match found.