1. mydriasis

noun. Reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs.
Synonyms
reflex action unconditioned reflex dilation reflex response physiological reaction innate reflex instinctive reflex inborn reflex reflex dilatation
Antonyms
contraction voluntary
Etymology
mydriasis (English)
mydriasis (Latin)
μυδρίασις (Ancient Greek (to 1453))
μύδρος (Ancient Greek (to 1453))
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