hypomesus olidus

from The Collaborative International Dictionary of English v.0.48
Smelt \Smelt\, n. [AS. smelt, smylt; akin to Dan. smelt.]
   1. (Zool.) Any one of numerous species of small silvery
      salmonoid fishes of the genus {Osmerus} and allied genera,
      which ascend rivers to spawn, and sometimes become
      landlocked in lakes. They are esteemed as food, and have a
      peculiar odor and taste.
      [1913 Webster]

   Note: The most important species are the European smelt
         ({Osmerus eperlans}) (called also {eperlan},
         {sparling}, and {spirling}), the Eastern American smelt
         ({Osmerus mordax}), the California smelt ({Osmerus
         thalichthys}), and the surf smelt ({Hypomesus olidus}).
         The name is loosely applied to various other small
         fishes, as the lant, the California tomcod, the spawn
         eater, the silversides.
         [1913 Webster]

   2. Fig.: A gull; a simpleton. [Obs.] --Beau. & Fl.
      [1913 Webster]

   {Sand smelt} (Zool.), the silverside.
      [1913 Webster]
    

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