Dilator

[dai'leitә]

(noun.) a surgical instrument that is used to dilate or distend an opening or an organ.

(noun.) a drug that causes dilation.

(noun.) a muscle or nerve that dilates or widens a body part.

Editor: Martin--From WordNet

(n.) One who, or that which, widens or expands.

(n.) A muscle that dilates any part.

(n.) An instrument for expanding a part; as, a urethral dilator.

Typist: Perry