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Definition of: tetrad
(tet′rad) noun
1. A collection of four, or the number four.
2. An atom, radical, or element that is quadrivalent.
3. Biol. The group of four chromatids into which two bivalent chromosomes divide in the last stages of meiosis.
4. A crystal having an axis showing fourfold symmetry. [<Gk. tetras, -ados group of four]
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