Definition of omicron noun from the Oxford Advanced Learner's Dictionary

 

omicron

 noun
noun
BrE BrE//əʊˈmaɪkrɒn//
 
; NAmE NAmE//ˈɑːməkrɑːn//
 
 
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the 15th letter of the Greek alphabet (O, o) Word Originfrom Greek o mikron ‘small o’.
See the Oxford Advanced American Dictionary entry: omicron