macrons

/ˈmeɪˌkɹɒnz/

IPA: /M AE1 K R AA0 N Z/

noun
  1. 1

    A short, straight, horizontal diacritical mark (¯) placed over any of various letters, usually to indicate that the pronunciation of a vowel is long.

Antonyms

Source: https://en.wiktionary.org/wiki/macron, https://en.wiktionary.org/wiki/macrons