American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
WordNet
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Elsewhere on the web
In medical parlance, the twitching is called hypnagogic myoclonus (the first word refers to sleep and the second to muscle twitches).— Yahoo! Answers: Latest Questions
A hiccup, believe it or not, is a kind of myoclonus.— Yahoo! Answers: Latest Questions
Anti-depresssants, such as Paxil and Zoloft, can cause myoclonus.— Yahoo! Answers: Latest Questions
Researchers believe a disruption of certain neurotransmitters are related to some forms of myoclonus.— Yahoo! Answers: Latest Questions
One neurotransmitter associated with myoclonus is serotonin, which constricts blood vessels and brings on sleep.— Yahoo! Answers: Latest Questions

Century Dictionary (1)
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