Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A muscle that dilates a body part, such as a blood vessel or the pupil of the eye.
  • n. An instrument that dilates a body part, such as a cavity, canal, or orifice.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any nerve or muscle that causes part of the body to dilate
  • n. Any drug that causes such dilation
  • n. An instrument used to dilate an orifice or cavity

from the GNU version of the Collaborative International Dictionary of English

  • n. One who, or that which, widens or expands.
  • n. A muscle that dilates any part.
  • n. An instrument for expanding a part.

from The Century Dictionary and Cyclopedia

  • n. One who or that which widens or expands; specifically, a muscle that dilates; a dilatator.
  • n. A surgical instrument, of various forms, used for dilating a wound, a canal, or an external opening of the body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a muscle or nerve that dilates or widens a body part
  • n. a surgical instrument that is used to dilate or distend an opening or an organ
  • n. a drug that causes dilation

Etymologies

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