From Wiktionary, the free dictionary
Borrowed from Russian еры́ (jerý), Old Church Slavonic ѥрꙑ (jery).
єри́ • (jerý) n inan (indeclinable)
- letter "ы" or yery, especially as a letter used in the Russian language
- яри́жка (jarýžka) (formerly spelled as єри́жка)
- йори́ (jorý) (the Cyrillic letter in general)