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In linguistics, a simulfix is a type of affix that changes one or more existing phonemes in order to modify the meaning of a morpheme.
Examples of simulfixes in English are generally considered irregularities, all of which left over from pluralization rules that existed before the Great Vowel Shift. They include:
- man → men, woman → women
- louse → lice, mouse → mice
- foot → feet, tooth → teeth
The transfixes of the Semitic languages may be considered a form of discontinuous simulfix.