1. a dilated formation or part.
  2. Pathology. an abnormal enlargement of an aperture or a canal of the body.
  3. Surgery.
    1. an enlargement made in a body aperture or canal for surgical or medical treatment.
    2. a restoration to normal patency of an abnormally small body opening or passageway, as of the anus or esophagus.
  4. Mechanics. the increase in volume per unit volume of a homogeneous substance.

c.1400, from Old French dilatation, from Late Latin dilatationem (nominative dilatatio) “a widening,” from past participle stem of Latin dilatare (see dilate).


  1. Physiological, pathological, or artificial enlargement of a cavity, canal, blood vessel, or opening.

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