Noun
i-mutation
(linguistics) A type of sound change in which a vowel's place of articulation is raised (becomes more close) under the influence of a following /i/, /j/ or similar sound.
I-mutation in High German I-mutation is visible in Old High German (OHG), c. 800 AD, only on /a/, which was mutated to /e/. Source: Internet
I-mutation is particularly visible in the inflectional and derivational morphology of Old English since it affected so many of the Old English vowels. Source: Internet
At some point prior to i-mutation, the form *duhtriz was modified to *dohtriz by analogy with the singular form, which then allowed it to be umlauted to a form that resulted in dehter. Source: Internet
I-mutation generally affected Old English vowels as follows in each of the main dialects. Source: Internet
I-mutation in Old English The vowels and diphthongs of proto-Old English prior to i-mutation (in black) and how they generally changed under i-mutation (in red). Source: Internet
A-restoration converted *tælu to talu, but left *tælljan alone, and it subsequently evolved to tellan by i-mutation. Source: Internet