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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