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dy·ad

   [dahy-ad]
noun
1.
a group of two; couple; pair.
2.
Biology.
a.
a secondary morphological unit, consisting of two monads: a chromosome dyad.
b.
the double chromosomes resulting from the separation of the four chromatids of a tetrad.
3.
Chemistry. an element, atom, or group having a valence of two. Compare monad, triad (def. 2a).
4.
Mathematics. two vectors with no symbol connecting them, usually considered as an operator.
5.
Sociology.
a.
two persons involved in an ongoing relationship or interaction.
b.
the relationship or interaction itself.
adjective
6.
of two parts; dyadic.

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Dyad is always a great word to know.
So is homogenous. Does it mean:
corresponding in structure because of a common origin
the science dealing with the description, identification, naming, and classification of organisms
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Origin:
1665–75; < Greek dyad- (stem of dyás) pair, equivalent to dý(o) two + -ad- -ad1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Example Sentences
  • Fuller knows the dyad of funny/hurtful, having run cover articles about people getting divorced, pregnant and tossed into rehab.
  • Make the case that a never-ceasing dyad of enmity helps no one.
  • Dyad is an abstract racing/shooter/puzzle hybrid where players move forward by man.
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Collins
World English Dictionary
dyad (ˈdaɪæd)
 
—n
1.  maths an operator that is the unspecified product of two vectors. It can operate on a vector to produce either a scalar or vector product
2.  an atom or group that has a valency of two
3.  a group of two; couple
 
[C17: from Late Latin dyas, from Greek duas two, a pair]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

dyad dy·ad (dī'ād', -əd)
n.

  1. Two individuals or units regarded as a pair, such as a mother and a daughter.

  2. A divalent atom or radical.

  3. One pair of homologous chromosomes resulting from the division of a tetrad during meiosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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