Dictionary.com
definitions

dyad

[dahy-ad]
|
SEE MORE SYNONYMS FOR dyad ON THESAURUS.COM

noun

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

adjective

of two parts; dyadic.

Origin of dyad

1665–75; < Greek dyad- (stem of dyás) pair, equivalent to dý(o) two + -ad- -ad1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for dyad

combination, duo, couple, two, team, match, pair, double, set, twosome, span, combine, yoke, brace, duality, twins, combo, deuce, doublet, binary

Examples from the Web for dyad

Historical Examples of dyad

  • The respondent was asked, Do you know that every Dyad is even?

    Aristotle

    George Grote

  • Some Dyad was then produced, which the respondent did not know to be a Dyad; accordingly he did not know it to be even.

    Aristotle

    George Grote

  • When you say a line, do you mean a dyad in length Form in Matter?

    Aristotle

    George Grote

  • For either the dyad is not One; or else the monads included therein are not monads ἐντελεχείᾳ (a. 14).

    Aristotle

    George Grote

  • There being six pairs of parallel edges on an octahedron, there are consequently six dyad axes of symmetry.

British Dictionary definitions for dyad

dyad

noun

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
an atom or group that has a valency of two
a group of two; couple

Word Origin for dyad

C17: from Late Latin dyas, from Greek duas two, a pair
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
dyad in Medicine

dyad

[dī′ăd′, -əd]

n.

Two individuals or units regarded as a pair, such as a mother and a daughter.
A divalent atom or radical.
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.