Definition of tetrad in English:

tetrad

Syllabification: tet·rad
Pronunciation: /ˈtetrad
 
/

noun

technical
A group or set of four.
More example sentences
  • In both strains, haploid phenotypes from tetrads yielding four viable spores may be used to measure the strength of crossover interference.
  • Two-thirds of the tetrads gave rise to four normally growing spores and one spore that formed a microcolony of 10 cells.
  • Early in meiosis, each pair of homologs comes together to form a tetrad containing two pairs of sister chromatids.

Origin

mid 17th century: from Greek tetras, tetrad- 'four, a group of four'.

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