ma·cron
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 long
长音符;平调符 Word Originmid 19th cent.: from Greek makron, neuter of makros ‘long’.