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Meaning of tetrad

tet•rad

Pronunciation: (te'trad), [key]
— n.
  1. a group of four.
  2. the number four.
  3. a group of four chromatids formed by synapsis at the beginning of meiosis.
  4. a tetravalent or quadrivalent element, atom, or group.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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