myosis

2 definitions found

myosis - Collaborative International Dictionary of English v.0.48 :

  Myosis \My*o"sis\, n. [NL., fr. Gr. ? to close the eyes or
     lips.] (Med.)
     Long-continued contraction of the pupil of the eye.
     [1913 Webster]

myosis - WordNet (r) 2.1 (2005) :

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