From Wiktionary, the free dictionary
сте́рни • (stérni) f inan or f inan pl
- inflection of стернь (sternʹ):
- genitive/dative/prepositional singular
- nominative/accusative plural
стерни́ • (sterní) f inan or f inan pl
- inflection of стерня́ (sternjá):
- genitive singular
- nominative/accusative plural