• synonyms


or di·lat·er

[dahy-ley-ter, di-, dahy-ley-]
  1. Anatomy. a muscle that dilates some cavity of the body.
  2. Surgery. an instrument for dilating body canals, orifices, or cavities.
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Origin of dilator

First recorded in 1595–1605; dilate + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for dilator

Historical Examples

  • (·01 grain) caused in a weakly colt some acceleration of the pulse and a partial paralysis of the dilator narium.

    Poisons: Their Effects and Detection

    Alexander Wynter Blyth

  • As the fibres which supply the dilator pupillæ are involved, the pupils are contracted.

  • Sterilized vaseline or glycerine of perchloride of mercury may be smeared over the point of the dilator to facilitate its passage.

  • This shoe is also provided with bar-clips, and forcibly expanded at the heels by means of a dilator.

    Diseases of the Horse's Foot

    Harry Caulton Reeks

  • The only difficulty which may be experienced is in entering the dilator into the punctum, owing to the small size of the latter.

British Dictionary definitions for dilator


dilater dilatator (ˌdaɪləˈteɪtə, ˌdɪ-)

  1. something that dilates an object, esp a surgical instrument for dilating a bodily cavity
  2. a muscle that expands an orifice or dilates an organ
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

dilator in Medicine


(dī-lātər, dīlā′-, dĭ-lā-)
  1. An instrument or a substance for enlarging a cavity, canal, blood vessel, or opening.
  2. A muscle that dilates an orifice or a body part, such as a blood vessel or the pupil of the eye.dilatator
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.