Definition of metaphony in US English:

metaphony

noun

Linguistics
  • Vowel alternation, as arising from ablaut or umlaut.

Origin

Late 19th century; earliest use found in Victor Henry (1850–1907). From French métaphonie (M. Bréal tr. F. Bopp Gramm. Comparée des Langues Indo-Européennes V. 23 (note)) from méta + -phonie, as a calque on German Umlaut; compare apophony.