(medicine) The condition of having abnormally large and dilatedpupils due to disease or drugs, particularly stimulants such as (meth)amphetamines, cocaine, etc.
From Latinmydriasis, from Ancient Greekμυδρίᾱσις(mudríāsis, “undue enlargement of the pupil”), from μύδρος(múdros, “mass of red hot material in a forge”), possibly because the pupil is particularly bright or sparkling when dilated, or because of the red eye effect when exposed to a flash of light.
