- a group or set of four
- Bot. a group of four cells formed by division within a spore mother cell during meiosis
- Chem. an atom, radical, or element that is tetravalent
- Genetics a group of four similar chromatids formed by the longitudinal division of a pair of homologous chromosomes during meiotic prophase
Origin of tetradClassical Greek tetras (gen. tetrados), four: see tetra-
- A group or set of four.
- A tetravalent atom, radical, or element.
- Biology a. A four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.b. A group of four haploid cells, such as spores, formed by meiotic division of one mother cell.
Origin of tetradGreek tetras, tetrad-; see kwetwer- in Indo-European roots.
- A group of four things.
- (chemistry) A tetravalent atom or radical.
- (biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
- (biology) Group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.