[tet.ra] n [by shortening fr. NL Tetragonopterus, former genus name, fr. LL tetragonum quadrangle + Gk pteron wing--more at tetragonal, feather] (1931): any of numerous small often brightly colored So. American characin fishes often bred in tropical aquariums
TETRA
Meaning of TETRA in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012