Birt

from The Collaborative International Dictionary of English v.0.48

Birt \Birt\ (b[~e]rt), n. [OE. byrte; cf. F. bertonneau. Cf.
   {Bret}, {Burt}.] (Zool.)
   A fish of the turbot kind; the brill. [Written also {burt},
   {bret}, or {brut}.] [Prov. Eng.]
   [1913 Webster]