mydriasis

noun

my·​dri·​a·​sis mə-ˈdrī-ə-səs 

: excessive or prolonged dilatation of the pupil of the eye

mydriatic

ˌmi-drē-ˈa-tik 

adjective or noun

Examples of mydriasis in a Sentence

Recent Examples on the Web

Dilated pupils—called mydriasis—range from 4 to 8 millimeters in size.4 Your pupils also constrict slightly to look at close objects and dilate slightly to look far away. —Troy Bedinghaus, Od, Verywell Health, 17 July 2023

Word History

Etymology

Latin, from Greek

First Known Use

1684, in the meaning defined above

Medical Definition

mydriasis

noun

my·​dri·​a·​sis mə-ˈdrī-ə-səs 

plural mydriases -ˌsēz 

: excessive or prolonged dilation of the pupil of the eye