Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
The condition of having abnormally large and dilated pupils due to illness or narcotics, particularly stimulants such as methamphetamine, cocaine, etc.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Topics: medicine, sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
Broader terms: dilation, dilatation, reflex, reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction
History
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.
Across languages
7 source translations are retained for this English entry.
