Webster's English Dictionary

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macron

ma.cron \'ma-k-.ra:n, 'mak-, -r*n\ n [Gk makron, neut. of makros long] : a 
   mark <macron> placed over a vowel to indicate that the vowel is lo ng or 
   placed over a syllable or used alone to indicate a stressed or long 
   syllable in a metrical foot