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