tetrad.
A group of four things.
Meaning & usage
A group of four things.
Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
A unit of land area of two by two (that is, four) square kilometres.
A tetravalent atom or radical.
A group of four basis vectors for a four-dimensional manifold in differential geometry.
A chord comprised of four notes; a tetrachord.
Where this word comes from
From Ancient Greek τετράς (tetrás), analysable as tetra- + -ad.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.