myosis

IN BRIEF: n. - Reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller;

Note: click on a word meaning below to see its connections and related words.

The noun has 2 meanings:

Meaning #1: 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

Meaning #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
  Synonyms: light reflex, pupillary reflex, miosis

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