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dilate

verb [I or T]
 
 
/daɪˈleɪt/ US  /ˈdaɪ.leɪt/

Definition

to (cause a part of the body to) become wider or further open: The pupils of the eyes dilate as darkness increases. This drug will dilate the arteries.Enlarging and inflatingBecoming biggerBecoming biggerEnlarging and inflating dilation
 
 
/daɪˈleɪ.ʃən/ noun [U]
(Definition of dilate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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