a Latin error for bosporus, from Greek bosporos, a name applied to several channels or straits between seas, literally "ox's ford," from bous "ox" (from PIE root *gwou- "ox, bull, cow") + poros "passage, ford" (see pore (n.)). Applied especially to that between the Sea of Marmora and the Black Sea (the Thracian Bosphorus).
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