Etymologically
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SlRJa XI–XVII 1975–

Barkhudarov, S. G. et al. (eds.) (1975–), Slovar' russkogo jazyka XI–XVII vv. [Словарь русского языка XI–XVII вв.], vols. 1–31, Moskva: Nauka / Azbukovnik / Lexrus

Footnotes show it as “SlRJa XI–XVII”.

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