| myosarcoma | (noun) sarcoma of muscle tissue | - |
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| myosin | (noun) the commonest protein in muscle; a globulin that combines with actin to form actomyosin | - |
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| myosis | (noun) reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller | Synonyms: light reflex, miosis, pupillary reflex |
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| (noun) an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest) | Synonyms: Bornholm disease, diaphragmatic pleurisy, epidemic myalgia, epidemic pleurodynia |
| myositis | (noun) inflammation of muscle tissue | - |
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