From Wiktionary, the free dictionary
Old Church Slavonic
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трищи • (trišti) (East Church Slavonic)
- thrice (three times)
1581, Ostrog Bible, 2 Chronicles 8.13:[…] три́щи лѣтомъ, и҆же е҆сть въ великїи пра́з꙽дъникъ ѻ҆прѣснокъ […]- […] three times in the year, even in the feast of unleavened bread […]