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Any of numerous small colorful tropical freshwater fishes chiefly of the family Characidae, such as the neon tetra, often kept in home aquariums.

[Short for New Latin Tetragōnopterīnī, group name : Late Latin tetragōnum, tetragon; see tetragon + Greek pteron, wing.]


n, pl -ra or -ras
(Animals) any of various brightly coloured tropical freshwater fishes of the genus Hemigrammus and related genera: family Characidae (characins)
[C20: short for New Latin tetragonopterus (former genus name), from tetragon + -o- + -pterous, from Greek pteron wing]


(ˈtɛ trə)

n., pl. -ras.
any of several small, brightly colored characin fishes, of tropical American waters.
[1930–35; shortening of New Latin Tetragonopterus former genus name. See tetragon, -o-, -pterous]


a combining form meaning “four”: tetralogy.
Also, esp. before a vowel,tetr-.
[< Greek, comb. form of téttares four]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tetra - brightly colored tropical freshwater fishestetra - brightly colored tropical freshwater fishes
characid, characin, characin fish - any freshwater fish of the family Characinidae
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TETRA is currently in discussions with the State of Arkansas regarding the availability of incentives related to the development of this project.
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EMC, which had been privately held and now becomes a wholly-owned subsidiary of Tetra Tech, provides engineering and program-management support in the areas of weapons-test ranges, systems logistics and information technology, primarily to the Department of Defense, officials said.
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Officials of Tetra Tech, headquartered in Pasadena, said Thursday that the five-year contract will be extensive, encompassing Lockheed Martin facilities nationwide.