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单词 tetrad
释义

tetrad

noun

tet·​rad ˈte-ˌtrad How to pronounce tetrad (audio)
: 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 How to pronounce tetrad (audio)
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 How to pronounce tetrad (audio)
: 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
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更新时间:2024/12/23 15:01:30