American English

Definition of upsilon noun from the Oxford Advanced American Dictionary

 

upsilon

 noun
noun
NAmE//ˈupsəˌlɑn//
 
, NAmE//ˈyupsəˌlɑn//
 
, NAmE//ˈʌpsəˌlɑn//
 
 
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the 20th letter of the Greek alphabet (ϒ, υ)
See the Oxford Advanced Learner's Dictionary entry: upsilon