Definition of omicron noun from the Oxford Advanced American Dictionary

 

omicron

 noun
noun
NAmE//ˈɑməˌkrɑn//
 
, NAmE//ˈoʊməˌkrɑn//
 
 
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the 15th letter of the Greek alphabet (O, o)
See the Oxford Advanced Learner's Dictionary entry: omicron