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.
1. Noun, singular or mass In dim light, dilator muscles in the iris contract and open the pupil to allow more light in. 2. Adjective Experiment with different positions on your nose to see if dilator strips will work for you.