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MYOSIS

Definition:

[noun] an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest)
Synonyms: epidemic pleurodynia, epidemic myalgia, diaphragmatic pleurisy, Bornholm disease
[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, pupillary reflex, miosis