Definitions from Wiktionary (tetrad)

▸ noun:  A group of four things.
▸ noun:  (biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
▸ noun:  (biology) A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
▸ noun:  (cartography) A unit of land area of two by two (that is, four) square kilometres.
▸ noun:  (chemistry) A tetravalent atom or radical.
▸ noun:  (mathematics) A group of four basis vectors for a four-dimensional manifold in differential geometry.
▸ noun:  (music) A chord comprised of four notes; a tetrachord.
▸ Also see tetrad



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