minnow

from WordNet (r) 3.0 (2006)

minnow
    n 1: very small European freshwater fish common in gravelly
         streams [syn: {minnow}, {Phoxinus phoxinus}]

from The Collaborative International Dictionary of English v.0.48

Killifish \Kil"li*fish`\, n. (Zool.)
   Any one of several small American cyprinodont fishes of the
   genus {Fundulus} and allied genera. They live equally well in
   fresh and brackish water, or even in the sea. They are
   usually striped or barred with black. Called also {minnow},
   and {brook fish}. See {Minnow}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Minnow \Min"now\, n. [OE. menow, cf. AS. myne; also OE. menuse,
   OF. menuise small fish; akin to E. minish, minute.] [Written
   also {minow}.]
   [1913 Webster]
   1. (Zool.) A small European fresh-water cyprinoid fish
      ({Phoxinus laevis}, formerly {Leuciscus phoxinus});
      sometimes applied also to the young of larger kinds; --
      called also {minim} and {minny}. The name is also applied
      to several allied American species, of the genera
      {Phoxinus}, {Notropis}, or {Minnilus}, and {Rhinichthys}.
      [1913 Webster]

   2. (Zool.) Any of numerous small American cyprinodont fishes
      of the genus {Fundulus}, and related genera. They live
      both in fresh and in salt water. Called also {killifish},
      {minny}, and {mummichog}.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Mummichog \Mum"mi*chog\, n. [Amer. Indian name.] (Zool.)
   Any one of several species of small American cyprinodont
   fishes of the genus {Fundulus}, and of allied genera; the
   killifishes; -- called also {minnow}. [Written also
   {mummychog}, {mummachog}.]
   [1913 Webster]