macron
noun/ˈmækrɒn/
/ˈmeɪkrɑːn/
(linguistics)- the mark (¯ ) that is placed over a vowel in some languages and in the International Phonetic Alphabet to show that the vowel is stressed or longWord Originmid 19th cent.: from Greek makron, neuter of makros ‘long’.
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macron