Added 10 October 2026 dilator noun Categories: The BodyThingsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about dilator at Wordnik → Where our words come from → Any nerve or muscle that causes part of the body to dilate. Any drug that causes such dilation. An instrument used to dilate an orifice or cavity. Related Words: hegarpupillovasodilatationconstrictorspeculumdivulsorlaxatorcompressortensorinflector Back to today's word