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

 

macron

 noun
noun
BrE BrE//ˈmækrɒn//
 
; NAmE NAmE//ˈmeɪkrɑːn//
 
(linguistics)
 
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the mark (¯ ) which is placed over a vowel in some languages and in the International Phonetic Alphabet to show that the vowel is stressed or long Word Origin mid 19th cent.: from Greek makron, neuter of makros ‘long’.
See the Oxford Advanced American Dictionary entry: macron