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From Ancient Greek τετράς (tetrás), analysable as tetra- + -ad.
- (Received Pronunciation, General American) IPA(key): /ˈtɛtɹæd/
- Hyphenation: tet‧rad
tetrad (plural tetrads)
- A group of four things.
- Synonyms: foursome, quartet; see also Thesaurus:quartet
- 2010, Siddhartha Mukherjee, The Emperor of All Maladies, Fourth Estate (2011), page 177:
- Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
- (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) A group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
- (cartography) A unit of land area of two by two (that is, four) square kilometres.
- 2010, Richard Mabey, Weeds: How Vagabond Plants Gatecrashed Civilisation and Changed the Way We Think about Nature, London: Profile Books, →ISBN:
- 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.
- (chemistry) A tetravalent atom or radical.
- (mathematics) A group of four basis vectors for a four-dimensional manifold in differential geometry.
- (group) monad, duad/dyad, triad, tetrad, pentad, hexad, hebdomad/heptad, ogdoad/octad, ennead/nonad, decad/decade, hendecad, dodecad/duodecade, chiliad
- English terms derived from Ancient Greek
- English terms prefixed with tetra-
- English terms suffixed with -ad
- English 2-syllable words
- English terms with IPA pronunciation
- English lemmas
- English nouns
- English countable nouns
- English terms with quotations