Dictionary

tetrad

noun tet·rad \ˈte-ˌtrad\

Definition of TETRAD

:  a group or arrangement of four: 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
te·trad·ic \te-ˈtra-dik\ adjective

Origin of TETRAD

Greek tetrad-, tetras, from tetra-
First Known Use: 1653

tetrad

noun tet·rad \ˈte-ˌtrad\   (Medical Dictionary)

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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