macron Meaning, Definition & Usage
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noun a diacritical mark (-) placed above a vowel to indicate a long sound
WordNet
Ma"cron noun
Etymology
NL., fr. Gr. long.Definitions
(Pron.) A short, straight, horizontal mark [-], placed over vowels to denote that they are to be pronounced with a long sound; as, a, in dame; e, in seam, etc.