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TETRAD
four, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
(noun) the cardinal number that is the sum of three and one
Source: WordNet® 3.1
Etymology
Noun
tetrad (plural tetrads)
A group of four things.
Synonyms: foursome, quartet, Thesaurus:quartet
(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.
(chemistry) A tetravalent atom or radical.
(mathematics) A group of four basis vectors for a four-dimensional manifold in differential geometry.
Coordinate terms
• monad · duad, dyad · triad · tetrad · pentad · hexad · heptad · octad · ennead, nonad · decad, decade · hendecad · dodecad, duodecade
Anagrams
• ratted, tarted
Source: Wiktionary
Tet"rad, n. Etym: [L. tetras, -adis, Gr. tétrade.]
1. The number four; a collection of four things; a quaternion.
2. (Chem.)
Definition: A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
Source: Webster’s Unabridged Dictionary 1913 Edition
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