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Definition of Tetrad

Babylon English

group of four; four
Tetrad Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The number four; a collection of four things; a quaternion.
  
(n.)
A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

tetrad
\tet"rad\ (?), n. [l. tetras, -adis, gr. &?;, &?;: cf. f. tétrade.]
1. the number four; a collection of four things; a quaternion.
2. (chem.) a tetravalent or quadrivalent atom or radical; as, carbon is a tetrad. [
tetrad
n : the cardinal number that is the sum of three and one [syn: four, 4, iv, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, little joe]



WordNet 2.0

Noun
1. the cardinal number that is the sum of three and one
(synonym) four, 4, IV, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
(hypernym) digit, figure
Tetrad Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Tetrad may refer to:
  • Tetrad (chromosomal formation)
  • Tetrad (genetics), the four spores of a yeast
  • Tetrad (general relativity), a mathematical frame of reference in general relativity
  • Tetrad (index notation), a concept in differential geometry
  • Tetrad (music), a set of four notes
  • Tetrad (symbol) or tetractys
  • Tetrad (unit of area)
  • Tetrad, a group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis

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Tetrad Definition from Society & Culture Dictionaries & Glossaries
Lexicon of Tiddlywinks
quad
Tetrad Definition from Religion & Spirituality Dictionaries & Glossaries
Rakefet
Tetrad [from Greek tetras four] The number four; a collection of four. "The Tetrad is esteemed in the Kabala, as it was by Pythagoras, the most perfect, or rather sacred number, because it emanated from the one, the first manifested Unit, or rather the three in one" (SD 2:599).
In chemistry, an atom, radical, or element that has a combining power of four. See also QUATERNARY; TETRAKTYS; TETRAGRAMMATON