WordReference Random House Unabridged Dictionary of American English © 2015
ma•cron  (mākron, makron), 
  1. Phoneticsa horizontal line used as a diacritic over a vowel to indicate that it has a long sound or other specified pronunciation, as (ā) in fate (fāt).
  • noun, nominal use of Greek makrón, neuter of makrós long. See macro- 1850–55

Collins Concise English Dictionary © HarperCollins Publishers::

macron /ˈmækrɒn/ n
  1. a diacritical mark (¯) placed over a letter, used in prosody, in the orthography of some languages, and in several types of phonetic respelling systems, to represent a long vowel
Etymology: 19th Century: from Greek makron something long, from makros long

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