Definition of dilate verb from the Oxford Advanced Learner's Dictionary

 

dilate

 verb
verb
BrE BrE//daɪˈleɪt//
 
; NAmE NAmE//daɪˈleɪt//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they dilate
BrE BrE//daɪˈleɪt//
 
; NAmE NAmE//daɪˈleɪt//
 
he / she / it dilates
BrE BrE//daɪˈleɪts//
 
; NAmE NAmE//daɪˈleɪts//
 
past simple dilated
BrE BrE//daɪˈleɪtɪd//
 
; NAmE NAmE//daɪˈleɪtɪd//
 
past participle dilated
BrE BrE//daɪˈleɪtɪd//
 
; NAmE NAmE//daɪˈleɪtɪd//
 
-ing form dilating
BrE BrE//daɪˈleɪtɪŋ//
 
; NAmE NAmE//daɪˈleɪtɪŋ//
 
 
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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. Horses sometimes dilate their nostrils when anxious. The patient’s pupils were dilated. opposite contract Word Origin late Middle English: from Old French dilater, from Latin dilatare ‘spread out’, from di- ‘apart’ + latus ‘wide’.
See the Oxford Advanced American Dictionary entry: dilate