Di‐lat″or (?), 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.