Etymologically
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Ushakov 1935–1940

Ushakov, D. N. (ed.) (1935–1940), Tolkovyj slovar' russkogo jazyka [Толковый словарь русского языка], 4 vols., Moskva: Sovetskaja ènciklopedija / OGIZ

Footnotes show it as “Ushakov”.

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