ablaut
Pronunciation:
/ˈæbˌlaʊt/noun
Definitions
The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation; as, get and got; sing and song; hang and hung, distinct from the phonetic influence of a succeeding vowel.
verb
Definitions
(of a vowel-containing linguistic component) To undergo a change of vowel.
To cause to change a vowel.