
1) Apophony 2) German linguistic term 3) Vowel 4) Vowel change in related words 5) Vowel sound
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https://www.crosswordclues.com/clue/ablaut

variation in root vowel of words to change meaning
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http://phrontistery.info/a.html

• (n.) 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.
Found on
http://thinkexist.com/dictionary/meaning/ablaut/

(from the article `Indo-European languages`) The four mid vowels participated in a pattern of alternation called `ablaut.` In the course of inflection and word formation roots and suffixes could ... The morphological use of vowel gradation (called ablaut) is well known from Indo-European languages (e.g., the vowel change in En...
Found on
http://www.britannica.com/eb/a-z/a/5

Jacob Grimm's term for the way in which Old English strong verbs formed their preterites by a vowel
Found on
http://www.encyclo.co.uk/local/22385
Ab'laut noun [ German , 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 ;
...Found on
http://www.encyclo.co.uk/webster/A/5

[
n] - a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song)
Found on
http://www.webdictionary.co.uk/definition.php?query=ablaut
noun a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song)
Found on
https://www.encyclo.co.uk/local/20974

(in Indo-European languages) regular alternation in the internal phonological structure of a word element, esp. alternation of a vowel, that is coordinated with a change in grammatical function or combination, as in English sing, sang, sung, song; apophony.
Found on
https://www.infoplease.com/dictionary/ablaut
No exact match found.