myosis

/maɪˈoʊsəs/

Definitions of myosis

1. 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
   synonyms: light reflex, miosis, pupillary reflex

   type of:

   inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex

   an automatic instinctive unlearned reaction to a stimulus
2. noun

   an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest)
   synonyms: Bornholm disease, diaphragmatic pleurisy, epidemic myalgia, epidemic pleurodynia

   type of:

   epidemic disease

   any infectious disease that develops and spreads rapidly to many people