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单词	tetrad
释义	tetrad noun tet·​rad ˈte-ˌtrad  : a group or arrangement of four: such as a : a group of four cells produced by the successive divisions of a mother cell a tetrad of spores b : a group of four synapsed chromatids that become visibly evident in the pachytene stage of meiotic prophase tetradic te-ˈtra-dik  adjective Example Sentences Recent Examples on the Web Creative awards aren’t limited to that entertainment tetrad known as the EGOT (Emmy, Grammy, Oscar, Tony). Peter Rubin, Longreads, 28 Feb. 2022 Those taps, along with any line completions, create new flashes and animations, and these very rarely obscure your all-important tetrads. Sam Machkovech, Ars Technica, 9 Nov. 2018 At its most technical, a blood moon is a series of four consecutive lunar eclipses or tetrad, which is not the case for the upcoming eclipse. Mika Mckinnon, Smithsonian, 26 Jan. 2018 The blood moon marked the beginning of a tetrad — four consecutive and complete lunar eclipses occurring at six-month intervals — which some see as a prophecy. Sean Rossman, USA TODAY, 21 Sep. 2017 Word History Etymology Greek tetrad-, tetras, from tetra- First Known Use 1653, in the meaning defined above Medical Definition tetrad noun tet·​rad ˈte-ˌtrad  : a group or arrangement of four: as a : a tetravalent element, atom, or radical b : a group of four cells arranged usually in the form of a tetrahedron and produced by the successive divisions of a mother cell a tetrad of spores c : a group of four synapsed chromatids that become visibly evident in the pachytene stage of meiotic prophase and are produced by the longitudinal splitting of each of two paired homologous chromosomes
随便看	direct drive direct dye direct examination direct exchange direct finder direct fire direct grant school direct initiative direct investment direct labor direct laying direct lighting direct loss by fire direct mail direct mails direct marketing direct material direct method direct object direct package direct positive direct primary direct printing direct process direct product

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