tetrad

noun
tet·​rad | \ ˈte-ˌtrad How to pronounce tetrad (audio) \

Definition of tetrad

: 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

Other Words from tetrad

tetradic \ te-​ˈtra-​dik How to pronounce tetrad (audio) \ adjective

Examples of tetrad in a Sentence

Recent Examples on the Web 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

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tetrad.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of tetrad

1653, in the meaning defined above

History and Etymology for tetrad

Greek tetrad-, tetras, from tetra-

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Dictionary Entries Near tetrad

tetracycline

tetrad

tetradactyl

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Cite this Entry

“Tetrad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tetrad. Accessed 6 Dec. 2021.

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More Definitions for tetrad

tetrad

noun
tet·​rad | \ ˈte-ˌtrad How to pronounce tetrad (audio) \

Medical Definition of tetrad

: 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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