Origin: 1585–95; earlier boiaren < Russ boyárin, akin to OCS bolyarinŭ (translating Gk megistán man of high status), Bulg bolyár(in); of disputed orig.
bo·yar (bō-yär', boi'ər) n. A member of a class of higher Russian nobility that until the time of Peter I headed the civil and military administration of the country and participated in an early duma.
[From boiaren, from Russian boyarin, from Old Russian boljarin, from Turkic baylar, pl. of bay, rich, Turkish bay, rich, gentleman.]
1591, "member of a Rus. aristocratic class (abolished by Peter the Great)," from Rus. boyarin, perhaps from boji "struggle," or from O.Slav. root bol- "great."