AskDefine | Define tetrad

Dictionary Definition

tetrad n : the cardinal number that is the sum of three and one [syn: four, 4, IV, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe]

User Contributed Dictionary



  1. A group of four things.
  2. Chemistry. A tetravalent atom or radical.
  3. Biology. Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.

Derived terms

Extensive Definition

Tetrad may refer to:
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