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

1595–1605; dilate + -or2

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World English Dictionary
dilator, dilater or dilatator (daɪˈleɪtə, dɪ-, daɪˈleɪtə, dɪ-, 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
dilater, dilater or dilatator
dilatator, dilater or dilatator

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American Heritage
Medical Dictionary

dilator di·la·tor (dī-lā'tər, dī'lā'-, 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. Also called dilatator.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
All hyperons and isotopes were modeled as more complex coherences based upon the fundamental dilator one.
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