dilator

Noun
  1. A muscle or nerve that dilates or widens a body part (synset 105229760)
    is a type of: body part - any part of an organism such as an organ or extremity
  2. A drug that causes dilation (synset 103203067)
    is a type of: drug - a substance that is used as a medicine or narcotic
    subtypes: vasodilative, vasodilator - a drug that causes dilation of blood vessels
  3. A surgical instrument that is used to dilate or distend an opening or an organ (synset 103202907)
    is a type of: surgical instrument - a medical instrument used in surgery
    same as: dilater

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