Bible Dictionaries
Macron

Webster's Dictionary

(n.) A short, straight, horizontal mark [-], placed over vowels to denote that they are to be pronounced with a long sound; as, a, in dame; /, in s/am, etc.

Bibliography Information
Webster, Noah. Entry for 'Macron'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​m/macron.html. 1828.