Any of numerous attractively coloured freshwater South American and African fishes (family Characidae), often kept in home aquariums. Tetras are small, lively, hardy, and unaggressive. The slender neon tetra (Paracheirodon, or Hyphessobrycon, innesi) has gleaming red hind parts and a neonlike blue-green stripe on its sides. The glowlight tetra (Hemigrammus erythrozonus) has a shining red stripe along each side. The body of the silver tetra (Ctenobrycon spilurus) is flattened sidewise
A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide
Terrestrial Trunked Radio Access, a digital standard embracing private and public access mobile radio for packet voice and data
(Terrestrial Trunked RAdio) TETRA is a set of standards developed by the European Telecommunications Standardisation Institute (ETSI) that describes a common mobile radio communications infrastructure throughout Europe This infrastructure is targeted primarily at the mobile radio needs of public safety groups (such as police and fire departments), utility companies, and other enterprises that provide voice and data communications services All of these groups have been high-end users of private/professional mobile radio (PMR) or public access mobile radio (PAMR) technology
TErrestrial Trunked RAdio TETRA is a standard for digital, cellular, trunked radio networks TETRA has been designed and developed notably as a mobile system for handling emergency and safety tasks
any of several species of small South American freshwater fish of the family Characidae; popular in home aquaria
Which is how Kit first heard about the T.W.I.T. back in London, and of the ghostly neo-Pythagorean cult of tetralatry or worship of the number four, currently the rage in certain European circles.
(Botanik, Bitkibilim) (in a red alga) the asexual diploid plant, resembling a gametophyte, which develops from a carpospore and gives rise to tetraspores
(Hayvan Bilim, Zooloji) Pristella maxillaris is the only species in the genus Pristella and is commonly known as the golden pristella tetra or X-ray tetra because of its highly transparent body. It is a widely distributed and adaptable fish, being found in coastal rivers of Brazil, French Guiana, Guyana, and Venezuela in both acidic and alkaline waters. Unlike most other characins, it is tolerant of (and sometimes found in) slightly brackish water. It is small (around 5 cm) and lives in large groups, and males can be distinguished from females by being smaller and thinner than the females. Like most other tetras, it feeds primarily on small insects and planktonic animals
(Hayvan Bilim, Zooloji) Pristella maxillaris is the only species in the genus Pristella and is commonly known as the golden pristella tetra or X-ray tetra because of its highly transparent body. It is a widely distributed and adaptable fish, being found in coastal rivers of Brazil, French Guiana, Guyana, and Venezuela in both acidic and alkaline waters. Unlike most other characins, it is tolerant of (and sometimes found in) slightly brackish water. It is small (around 5 cm) and lives in large groups, and males can be distinguished from females by being smaller and thinner than the females. Like most other tetras, it feeds primarily on small insects and planktonic animals
[ 'te-tr& ] (noun.) 1931. by shortening from New Latin Tetragonopterus, former genus name, from Late Latin tetragonum quadrangle + Greek pteron wing; more at TETRAGONAL, FEATHER.