Main Entry: ma·cron

Pronunciation: \ˈmā-ˌkrän, ˈma-, -krən\

Function: noun

Etymology: Greek makron, neuter of makros long

Date: 1851

: a mark ⁻ placed over a vowel to indicate that the vowel is long or placed over a syllable or used alone to indicate a stressed or long syllable in a metrical foot