dilator

(lāt′ər; dī lāt-, də-)

noun

a person or thing that dilates; specif.,
  1. any muscle that dilates a part of the body
  2. a surgical instrument for dilating an opening, wound, etc.

See dilator in American Heritage Dictionary 4

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

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