Macron vs. Diacritic: What's the Difference?

A symbol ( ¯ ) placed over a vowel to show that it has a long sound.

Diacritical.

The horizontal mark ( ¯ ) used to indicate a stressed or long syllable in a foot of verse.

(Medicine) Diagnostic or distinctive.

(orthography) A short, straight, horizontal diacritical mark (◌̄) placed over a letter, usually to indicate that the pronunciation of a vowel is long.

A mark, such as the cedilla of façade or the acute accents of résumé, added to a letter to indicate a special phonetic value or distinguish words that are otherwise graphically identical.

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.

Distinguishing

A diacritical mark (-) placed above a vowel to indicate a long sound

Denoting a distinguishing mark applied to a letter or character.

A special mark added to a letter to indicate a different pronunciation, stress, tone, or meaning.

That separates or distinguishes; - applied to points or marks used to distinguish letters of similar form, or different sounds of the same letter, as, ā, ă, ä, ō, ǒ, etc.

A mark added to a letter to indicate a special pronunciation

Capable of distinguishing;