Definition of dilate verb from the Oxford Advanced American Dictionary

 

dilate

 verb
verb
NAmE//ˈdaɪleɪt//
 
, NAmE//daɪˈleɪt//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they dilate
 
he / she / it dilates
 
past simple dilated
 
-ing form dilating
 
 
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to become or to make something larger, wider, or more open Her eyes dilated with fear. dilate something dilated pupils/nostrils Red wine can help to dilate blood vessels. opposite contract
NAmE//daɪˈleɪʃn//
 
noun [uncountable, countable] The doctor checked his eyes but there was no abnormal pupil dilation.
See the Oxford Advanced Learner's Dictionary entry: dilate