ABLAUT
ablaut
(noun) a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song)
Source: WordNet® 3.1
Etymology
Noun
ablaut (countable and uncountable, plural ablauts)
(linguistics) 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. [Mid 19th century.]
Synonyms
• (vowel) gradation, alternation, apophony
Verb
ablaut (third-person singular simple present ablauts, present participle ablauting, simple past and past participle ablauted)
(intransitive, linguistics, of a vowel-containing linguistic component) To undergo a change of vowel.
(transitive, linguistics) To cause to change a vowel.
Anagrams
• tabula
Source: Wiktionary
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