Her pupils began to dilate as she entered the dark room.The doctor will dilate your eyes before the examination.Certain medications can cause your blood vessels to dilate.
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Dilate
/daɪˈleɪt/
To make something wider or larger, or to become wider or larger
Examples:
The pupils dilate in dim lighting.He watched her eyes dilate with surprise.The flower petals begin to dilate at dawn.
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Ways to tell them apart:
Dilate is the correct spelling; it means to enlarge or expand.
Dialate is a common misspelling of dilate.
Remember that dilate is like delineate, both involve making something clearer or bigger in a certain context.
Touching on optical terms, dilate involves widening like pupils of the eyes, with no a.
Think of dilate as making a dull thing late by expanding its visibility.