The traditional name of one of the initial consonant mutations of Irish. It affects only word-initial plosives and f in certain environments, for instance after plural possessive adjectives and after certain numbers. The original consonant letter remains in the spelling and is preceded by a letter or letters representing the replacement sound.
- f is replaced by v: fuinneog (window) fɯiˈnʲoːɡ, bhur bhfuinneoɡ (your (plur) window) vur vɯiˈnʲoːɡ.
- voiceless plosives are replaced by homorganic voiced plosives: capall (horse) ˈkapəɫ , seacht gcapall (seven horses) ˈʃaxt ˈɡapəɫ
- voiced plosives are replaced by homorganic voiced nasals: doras (door) ˈdɒrəs, ɑ ndoras (their door) ə ˈnɒrəs