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Tetra meaning7/6/2023 ![]() ![]() ![]() These examples are programmatically compiled from various online sources to illustrate current usage of the word 'tetrapod.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. noun tetrahedron te-tr-h-drn plural tetrahedrons or tetrahedra te-tr-h-dr : a polyhedron that has four faces Illustration of tetrahedron Did you know The simplest tetrahedron is made of four equal-sided triangles: one is used as the base, and the other three are fitted to it and each other to make a pyramid. 2021 Previous research had shown that HoxD13 is active in the developing tetrapod limb when the wrists and digits form. 2021 This fossil appears to be an early amniote, which is a land-living vertebrate that lays eggs, according to Adam Huttenlocker, an outside specialist on the team who researches early tetrapod fossils and is an assistant professor at USC. any of various marine food and game fishes. tetr- (before a vowel) Etymology edit From Ancient Greek - (tetra-), combining form of Ancient Greek (téttares), from (téssares, four). Random sequences of tetrominoes, or tetrads, fall onto a playing field. any small carnivorous freshwater cyprinoid fish of the family Characidae, of Central and South America and Africa. ( Tetra is also any of the tropical freshwater fishes of the genus Hemigrammus.) The premise of the game is fairly simple. Ed Yong, Discover Magazine, 30 June 2010 The exact species and classification have yet to be determined, but the fossil is a tetrapod - meaning animal with four legs - and could be an early ancestor of either reptiles or mammals. Tetra is a Greek numerical prefix meaning four, and tennis was the game designer’s sport of choice. 2019 The bite would have been the largest of any tetrapod (the animal group that includes mammals, birds, reptiles and amphibians). Charles Choi, Discover Magazine, 17 Jan. Terrestrial Trunked Radio, also known as TETRA, is an initiative from the European Telecommunications Standards Institute (ETSI) for a single standard for digital mobile radio services. In chemistry, tetra- is specifically used to indicate four atoms or four groups of atoms in compounds, e.g., tetrachloride. It is used in a great many scientific and other technical terms. 2010 To help solve this mystery, scientists created a robot based off fossils of Orobates pabsti, a plant-eating tetrapod about 33 inches long (85 centimeters). Tetra- is a combining form used like a prefix meaning four. Connor Lynch, Discover Magazine, 20 June 2022 These include Panderichthys, a fish with a large tetrapod-like head and a muscular pair of front fins. 2021 But Eusthenopteron foordi, another stem tetrapod that comes after Paleospondylus, had paired fins and cranial development even in juveniles. Rebecca Boyle, Scientific American, 1 Mar. Recent Examples on the Web Our moon’s tides most likely played a role in evolution, shepherding the first plants and tetrapods from the salty marshes of the coasts and onto land. ![]()
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