Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A group or set of four.
- noun A tetravalent atom, radical, or element.
- noun A four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.
- noun A group of four haploid cells, such as spores, formed by meiotic division of one mother cell.
from The Century Dictionary.
- noun The number four; also, a collection of four things. Also
quadrad . - noun In chem., an atom the equivalence of which is four, or an element one atom of which is equivalent, in saturating power, to four atoms of hydrogen.
- noun In morphology, a quaternary unit of organization resulting from individuation or integration of an aggregate of triads. See triad, dyad.
- noun In cytology, a group of four chromosomes formed by the division of a single chromosome; a quadripartite chromosome.
from the GNU version of the Collaborative International Dictionary of English.
- noun The number four; a collection of four things; a quaternion.
- noun (Chem.) A tetravalent or quadrivalent atom or radical.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A group of four things.
- noun chemistry A
tetravalent atom orradical . - noun biology Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
- noun biology Group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the cardinal number that is the sum of three and one
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
The Emperor of All Maladies Siddhartha Mukherjee 2010
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Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
The Emperor of All Maladies Siddhartha Mukherjee 2010
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Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
The Emperor of All Maladies Siddhartha Mukherjee 2010
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To create a tetrad, and discover insights into any human technology whatsoever, consider any artifact, and ponder these questions:
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Incidentally, Radix is actually the first book in a thematic “tetrad”.
Reading Challenge #10 – Radix AA Attanasio « It Doesn't Have To Be Right… 2009
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(I, Thou, objective world) to a tetrad, by a process of completion, as it were, to embrace the “godhead that lives in impenetrable silence”, the objective counterpart of the Ego, which had been suggested to him by his readings of Eckhart.
Hermann Weyl Bell, John L. 2009
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The color palette is actually pretty consistent with typical color scheme design methods looks sort of like a color tetrad was made once they settled on the precise shade of yellow.
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You can generate single monochromatic, complimentary, triad, tetrad, analogic and accented analogic colour palettes.
Color Scheme Designer Is A Diverse Palette Creator | Lifehacker Australia 2009
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Beyond the 1980's: Space defense, laser weapons, and the strategic tetrad (Hudson Institute paper) by Barry Smernoff
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In the commencement of these it is very difficult to determine those which will come to a crisis after a long interval; for these beginnings are very similar, but one should pay attention from the first day, and observe further at every additional tetrad, and then one cannot miss seeing how the disease will terminate.
tbtabby commented on the word tetrad
When Tetris fever first swept the nation, Nintendo referred to the blocks as "Tetrads." I personally like that better than "Tetriminoes," the term that's accepted today.
March 4, 2019