Macron



[mey-kron, mak-ron] /ˈmeɪ krɒn, ˈmæk rɒn/

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).
/ˈmækrɒn/
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
n.

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

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