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dyad

American  
[dahy-ad] / ˈdaɪ æd /
Sometimes diad

noun

  1. a group of two; couple; pair.

  2. 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.

  3. Chemistry. an element, atom, or group having a valence of two.

  4. Mathematics. two vectors with no symbol connecting them, usually considered as an operator.

  5. Sociology.

    1. two persons involved in an ongoing relationship or interaction.

    2. the relationship or interaction itself.

adjective

  1. of two parts; dyadic.

dyad British  
/ ˈdaɪæd /

noun

  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

"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

Etymology

Origin of dyad

First recorded in 1665–75; from Greek dyad- (stem of dyás ) “pair,” equivalent to dý(o) “two” + -ad- noun suffix; two, -ad 1

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.