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tetrad Definition

tet·rad (te′trad′)

noun

  1. a group or set of four
  2. Bot. a group of four cells formed by division within a spore mother cell during meiosis
  3. Chem. an atom, radical, or element that is tetravalent
  4. Genetics a group of four similar chromatids formed by the longitudinal division of a pair of homologous chromosomes during meiotic prophase

Etymology: Gr tetras (gen. tetrados), four: see tetra-

tetrad Usage Examples

Converse of object

  • select: The randomly selected tetrads are also to be surveyed in January 2005.
  • survey: A total of 97 % of the tetrads surveyed in 1998 had also been covered in 1987.
  • occupy: No gone from many tetrads occupied in the Essex Breeding Atlas.
  • call: All pollen grains develop initially in groups of four called tetrads.

Adjective modifier

  • many: No gone from many tetrads occupied in the Essex Breeding Atlas.
  • new: During that season ( from October to March ), the presence of harvest mice was confirmed in 106 new tetrads!

Modifies a noun

  • survey: Figures in italics are derived from the tetrad survey.
  • distribution: Many counties have published tetrad distribution maps of various groups - Worcestershire none.
  • map: The atlas is provided with tetrad maps produced by the Records Center.
  • level: The data are only fully comprehensive at the 10-km square level and not at the tetrad level.
  • record: Most have proved to be new tetrad records and some have been new to that ten km square.