This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A diacritical mark placed above a vowel to indicate a long sound or phonetic value in pronunciation, such as (ā) in the word make.

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

n. A short, straight, horizontal diacritical mark (¯) placed over any of various letters. It usually is used to indicate that the pronunciation of the vowel is long, in Mandarin pinyin (Chinese), it indicates the first tone, e.g. chūzūchē.

n. 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.

n. In grammar, a short horizontal line placed over a vowel to show that it is long in quantity, or, as in English, has a “long” sojnd: opposed to the breve, or mark of a short vowel.

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

"Now I know that the long mark is called a macron and the short mark is called a breve."

diacritic    diacritical mark   

solidus    breve    vinculum   

macrotone   

éclair    colliculus    lobule    turbinate    maxilla    pangeran    depreciatory    understrapper    circumflex    godship