metaphonyn.

1894 V. Henry Short Compar. Gram. Eng. & German 358 Mod. German, though keeping the apophony, obscures it by borrowing the metaphony from the subjunctive.

1912 Mod. Lang. Notes 27 54/2 There must be more than five vowels, or else all of his theory of metaphony and much of what he says on vowel quantity will have to be abandoned.

1950 Trans. Philol. Soc. 1949 23 The name apophony may be retained for the quantitative alternations, and..the qualitative alternations may be distinguished as metaphony.

1953 K. Jackson Lang. & Hist. in Early Brit. 371 -áu̯i- > eu appears to be due to metaphony rather than to palatalisation.

1973 A. H. Sommerstein Sound Pattern Anc. Greek ii. 76 There are three main ablaut rules—Vṛddhi, Vowel Weakening and e/o ablaut or metaphony.

1987 Trans. Philol. Soc. 38 The emergence of metaphonic alternation may be illustrated from the declensional paradigm, where the masculine singular inflection -u and the plural inflection -i trigger metaphony.