my·dri·a·sis /məˈdraɪəsəs/
  瞳孔開大; 瞳孔擴大
  my·dri·a·sis /məˈdraɪəsəs/ 名詞
  瞳孔放大,瞳孔散大
  My·dri·a·sis n.  Physiol. & Med. A long-continued or excessive dilatation of the pupil of the eye.
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  mydriasis
       n : reflex pupillary dilation as a muscle pulls the iris
           outward; occurs in response to a decrease in light or
           certain drugs