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macron

[mey-kron, mak-ron]
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noun
  1. a 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).

Origin of macron

1850–55; noun use of Greek makrón, neuter of makrós long. See macro-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for macron

macron

noun
  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

Word Origin

C19: from Greek makron something long, from makros long
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for macron

n.

"short horizontal line placed over a vowel to indicate length," 1827, from Greek makron, neuter of makros "long" (see macro-).

Online Etymology Dictionary, © 2010 Douglas Harper