Webster’s Revised Unabridged Dictionary · 1913
Dilator
Di·lat′or (dĭ·lāt′ẽr or ḋ·), n. [See Dilate.] 1. One who, or that which, widens or expands.
2. (Anat.) A muscle that dilates any part.
3. (Med.) An instrument for expanding a part; as, a urethral dilator.