ma·cron /ˈmeˌkrɑn, ˈmæ, krən/
長音符號
Ma·cron n. Pron. A short, straight, horizontal mark [-], placed over vowels to denote that they are to be pronounced with a long sound; as, ā, in dāme; ē, in sēam, etc.
Syn: -- macrotone.
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macron
n : a diacritical mark (-) placed above a vowel to indicate a
long sound