Medical Dictionary

tetrad

noun tet·rad \ˈte-ˌtrad\

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
April 01, 2015
diapause Hear it
a period of physiological dormancy
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