Dilate

usgb/daɪˈleɪt/Volume
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Physical ReactionPlay
Dilate refers to a natural, involuntary reaction of the body to certain stimuli. SlideHis nostrils dilated as he smelled the freshly baked pie.
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Not Always VisiblePlay
Some dilations, like blood vessels, are internal and cannot be seen. SlideThe doctor explained how the vessels dilate to increase blood flow.
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Light SensitivityPlay
Pupil dilation adjusts the eye's sensitivity to light for better vision. SlideIn the dark room, her pupils dilated rapidly.