DILATOR

dilator. Dilator, n. what extends or widens, a muscle

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Di‐lat″or (?), n. [[See Dilate.]] 1. 1. One who, or that which, widens or expands.
2. 2. (Anat.) A muscle that dilates any part.
3. 3. (Med.) An instrument for expanding a part; as, a urethral dilator.