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WordNet (r) 3.0 (2006) (WordNet)

myosis
n 1: an acute infectious disease occurring in epidemic form and
featuring paroxysms of pain (usually in the chest) [synonym:
{epidemic pleurodynia}, {epidemic myalgia}, {myosis},
{diaphragmatic pleurisy}, {Bornholm disease}]
2: reflex contraction of the sphincter muscle of the iris in
response to a bright light (or certain drugs) causing the
pupil to become smaller [synonym: {light reflex}, {pupillary
reflex}, {miosis}, {myosis}]