Englishfor English speakers
iris
Noun
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Your iris is the black part in the middle of your eye.
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An iris is a type of flowering plant.
dilatation
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noun
the state of being stretched beyond normal dimensions
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noun
(= dilation)
the act of expanding an aperture
the dilation of the pupil of the eye
reflex
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noun
an automatic instinctive unlearned reaction to a stimulus
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adjective
(= automatic, reflexive)
without volition or conscious control
the automatic shrinking of the pupils of the eye in strong light
a reflex knee jerk
sneezing is reflexive