Mā'cron, n.
n. [Gr. μακρός, long.] (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; ī, in dīme; ō, in dōme.
n. [Gr. μακρός, long.] (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; ī, in dīme; ō, in dōme.