Tetrad

/ˈtɛtɹæd/ · noun

Meaning

A group of four things..

Definitions by Sense

1. A group of four things.
2. (biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
3. (biology) A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
4. (cartography) A unit of land area of two by two (that is, four) square kilometres.
5. (chemistry) A tetravalent atom or radical.
6. (mathematics) A group of four basis vectors for a four-dimensional manifold in differential geometry.
7. (music) A chord comprised of four notes; a tetrachord.

Example Sentences

Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.

They took figures for the abundance of invasive weeds mapped according to the normal grid unit of the 'hectad', or 10 × 10 km square, and then looked at how abundant these species were mapped at a much finer scale – in 'tetrads', or 2 × 2 km squares, inside these hectads.

Synonyms for tetrad

Antonyms for tetrad

Related Words

Word Forms

• tetrads

Usage Notes

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