Webster's English Dictionary

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tetra

tet.ra \'te-tr*\ n [by shortening fr. NL Tetragonopterus, former genus 
   name, fr. L tetrag]onum quadrangle + Gk pteron wing - more at TETRAGONAL, 
   FEATHER : any of numerous small brightly colored So. American characin 
   fishes ofte n bred in the tropical aquarium