'Myosis' definitions:

Definition of 'myosis'

(from WordNet)
noun
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]
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 [syn: light reflex, pupillary reflex, miosis, myosis]

Definition of 'Myosis'

From: GCIDE
  • 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]