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The Collaborative International Dictionary
Myosis

Myosis \My*o"sis\, n. [NL., fr. Gr. ? to close the eyes or lips.] (Med.) Long-continued contraction of the pupil of the eye.

Wiktionary
myosis

n. (alternative spelling of miosis English)

WordNet
myosis
  1. n. an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest) [syn: epidemic pleurodynia, epidemic myalgia, 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 [syn: light reflex, pupillary reflex, miosis]

  3. [also: myoses (pl)]