Broken plural
(重定向自Broken plurals)
In linguistics, a broken plural (or internal plural) is an irregular plural form of a noun or adjective found in the Semitic languages and other Afroasiatic languages such as Berber. Broken plurals are formed by changing the pattern of consonants and vowels inside the singular form. They contrast with sound plurals (or external plurals), which are formed by adding a suffix. It is distinct from Germanic umlaut, a form of vowel mutation found in Germanic languages.