Meanings
nounmydriasis (countable and uncountable, plural mydriases)
plural mydriases
- countableuncountablemedicineThe condition of having abnormally large and dilated pupils due to illness or narcotics, particularly stimulants such as methamphetamine, cocaine, etc.
Synonyms & antonyms
Opposite
Origin
- Ancient Greekμυδρίᾱσις“undue enlargement of the pupil”
- Latinmydriasis
- Englishmydriasis
From Latin mydriasis, from Ancient Greek μυδρίᾱσις (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.
More words from Latin, Ancient Greek
Full word history & related roots →Translations
Ancient Greek μυδρίασις
- μυδρίασις (mudríasis)Translations
Bulgarian разширяване на зеницата
- разширяване на зеницата (razširjavane na zenicata)Translations
French mydriase
- mydriaseTranslations
Greek μυδρίαση
- μυδρίαση (mydríasi)Translations
Hungarian pupillatágulat
- pupillatágulatTranslations
Irish leathadh imrisc
- leathadh imriscTranslations
Italian midriasi
- midriasiTranslations
Cite this entry
APA
mydriasis. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/mydriasis
MLA
“mydriasis.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mydriasis. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “mydriasis,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/mydriasis.
Source: mydriasis on Wiktionary, CC BY-SA 4.0.