Bos"po*rus (bŏs"p?*rŭs), n.
[L.] 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.]