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dyad

 - 4 dictionary results
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dy⋅ad

  [dahy-ad]
Use dyad in a Sentence
–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.
Origin:
1665–75; < Gk dyad- (s. of dyás) pair, equiv. to dý(o) two + -ad- -ad 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Dyad Communications
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dy·ad   (dī'ād', -əd)   
n.  

  1. Two individuals or units regarded as a pair: the mother-daughter dyad.

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

  3. Chemistry A divalent atom or radical.

  4. Mathematics

    1. A function that draws a correspondence from any vector u to the vector (v·u)w and is denoted vw, where v and w are a fixed pair of vectors and v·u is the scalar product of v and u. For example, if v = (2,3,1), w = (0,-1,4), and u = (a,b,c), then the dyad vw draws a correspondence from u to (2a + 3b + c)w.

    2. A tensor formed from a vector in a vector space and a linear functional on that vector space.

adj.  Made up of two units.

[From Greek duas, duad-, from duo, two; see dwo- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: dy·ad
Variant: also di·ad /'dI-"ad, -&d/
Function: noun
1 : two individuals (as husband and wife)maintaining a sociologically significant relationship
2 : a meiotic chromosome after separation of the two homologous members of a tetrad —dy·ad·ic /dI-'ad-ik/ adjective —dy·ad·i·cal·ly /-i-k(&-)lE/ adverb
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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