Source : Webster's Revised Unabridged Dictionary (1913)

Etheostomoid \E`the*os"to*moid\, a. [NL. etheostoma name of a
   genus + -oid.] (Zo["o]l.)
   Pertaining to, or like, the genus {Etheostoma}. -- n. Any
   fish of the genus {Etheostoma} and related genera, allied to
   the perches; -- also called {darter}. The etheostomoids are
   small and often bright-colored fishes inhabiting the fresh
   waters of North America. About seventy species are known. See
   {Darter}.