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Webster 1913 Edition

Ablaut

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Ab′laut

,
Noun.
[Ger., off-sound;
ab
off +
laut
sound.]
(Philol.)
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.

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