Medical Definition of tetrad
: a group or arrangement of four: asa: a tetravalent element, atom, or radicalb: 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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