ABLAUTS

Noun

ablauts

plural of ablaut

Verb

ablauts

Third-person singular simple present indicative form of ablaut

Source: Wiktionary

ABLAUT

Ab"laut, n. Etym: [Ger., off-sound; ab off + laut sound.] (Philol.)

Definition: The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation; as, get, gat, got; sing, song; hang, hung. Earle.

Source: Webster’s Unabridged Dictionary 1913 Edition