Mydriasis
//mɪˈdɹaɪ ə sɪs// noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 The condition of having abnormally large and dilated pupils due to illness or narcotics, particularly stimulants such as methamphetamine, cocaine, etc. countable, uncountable
- 2 reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs wordnet
Antonyms
All antonymsExample
More examples"Technically, drugs that cause miosis can relieve the PNS effects of those causing mydriasis since sympathetic and parasympathetic stimulation tend to negate each others' effects."
Etymology
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.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.