from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A group or set of four.
- n. A tetravalent atom, radical, or element.
- n. Biology A four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.
- n. Botany Biology A group of four cells, as of spores or pollen grains, formed by division of one mother cell.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A group of four things.
- n. A tetravalent atom or radical.
- n. Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
- n. Group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis.
from the GNU version of the Collaborative International Dictionary of English
- n. The number four; a collection of four things; a quaternion.
- n. A tetravalent or quadrivalent atom or radical.
from The Century Dictionary and Cyclopedia
- n. In cytology, a group of four chromosomes formed by the division of a single chromosome; a quadripartite chromosome.
- n. The number four; also, a collection of four things. Also quadrad.
- n. 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.
- n. In morphology, a quaternary unit of organization resulting from individuation or integration of an aggregate of triads. See triad, dyad.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the cardinal number that is the sum of three and one
Religious movements and cults are often founded on a tetrad of elements: a prophet, a prophecy, a book, and a revelation.
To create a tetrad, and discover insights into any human technology whatsoever, consider any artifact, and ponder these questions:
Incidentally, Radix is actually the first book in a thematic “tetrad”.
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.
You can generate single monochromatic, complimentary, triad, tetrad, analogic and accented analogic colour palettes.
(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.
Beyond the 1980's: Space defense, laser weapons, and the strategic tetrad (Hudson Institute paper) by Barry Smernoff
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.
Adjust the triad, tetrad and analogic views to sample a range of complementary colors
View color families with mono, contrast, triad, tetrad and analogic relationships