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The disappearing vowel is called a fleeting / mobile vowel («беглые» гласные). Some words have them, most don't. If a noun has a fleeting vowel, then it will obey these rules:

The disappearing vowel is called a fleeting / mobile vowel («беглая» гласная). Some words have them, most don't. If a noun has a fleeting vowel, then it will obey these rules:

The disappearing vowel is called a fleeting / mobile vowel. Some words have them, most don't. If a noun has a fleeting vowel, then it will obey these rules:

Fleeting vowels historically formed after the Fall or the Jers (падение редуцированных) in 11-13 centuries AD.

The disappearing vowel is called a fleeting / mobile vowel («беглые» гласные). Some words have them, most don't. If a noun has a fleeting vowel, then it will obey these rules:

Fleeting vowels historically formed after the Fall of the Jers (падение редуцированных) in 11-13 centuries AD.

Fleeting vowels also exist in verbs (брать - беру, звать - зову), pronouns (весь - всего́), prefixes (взобраться - взберусь) and prepositions (к нему - ко мне).

Fleeting vowels also exist in verbs (брать - беру́, звать - зову́), adjectives (кра́ткий - кра́ток, ну́жный - ну́жен), pronouns (весь - всего́), prefixes (взобраться - взберусь) and prepositions (к нему - ко мне).