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Dilator or dilatator is a medical term with a number of uses, including:
- A surgical instrument or medical implement used to induce dilation, that is, to expand an opening or passage such as the cervix (see cervical dilator), urethra, esophagus, or vaginal introitus.
- A pharmacological treatment used to induce dilation, such as cervical dilation, vasodilation, or pupillary dilation.
- A muscle which causes dilation of a part, for example, the iris dilator muscle or the dilator naris muscle.
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