ablaut

noun
ab·​laut | \ˈä-ˌblau̇t, ˈa-;ˈäp-ˌlau̇t \

Definition of ablaut 

: a systematic variation of vowels in the same root or affix or in related roots or affixes especially in the Indo-European languages that is usually paralleled by differences in use or meaning (as in sing, sang, sung, song)

First Known Use of ablaut

1838, in the meaning defined above

History and Etymology for ablaut

borrowed from German Ablaut, from ab "down, from" (going back to Old High German ab, aba, preposition) + Laut "sound," going back to Middle High German lūt, going back to Old High German hlūtī, lūtī, liutī, derivative from the base of hlūt "loud, strident"; akin to Old English hlūd "loud" — more at of entry 1, loud

Note: As a term in Germanic and Indo-European comparative linguistics, ablaut was introduced in 1819 by Jacob Grimm in Deutsche Grammatik, vol. 1, p. 543. The word was used by earlier German grammarians pejoratively to refer to strong verbs—hence perhaps literally, "discordance," with ab- alluding to the deviation of the "irregular" strong verbs from "regular" weak verbs.

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Dictionary Entries near ablaut

ablative

ablative absolute

ablator

ablaut

ablaze

able

-able

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The first known use of ablaut was in 1838

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