bosporus

Bos"po*rus, n. Etym: [L.] Defn: A strait or narrow sea between two seas, or a lake and a seas; as, the Bosporus (formerly the Thracian Bosporus) or Strait of Constantinople, between the Black Sea and Sea of Marmora; the Cimmerian Bosporus, between the Black Sea and Sea of Azof. [Written also Bosphorus.]

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