Main Entry: tet·rad

Pronunciation: \ˈte-ˌtrad\

Function: noun

Etymology: Greek tetrad-, tetras, from tetra-

Date: 1653

: 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