dy·​ad | \ˈdī-ˌad, -əd\

Definition of dyad 

1 : pair specifically, sociology : two individuals (such as husband and wife) maintaining a sociologically significant relationship

2 genetics : a meiotic chromosome after separation of the two homologous (see homologous sense 1a(2)) members of a tetrad

3 mathematics : an operator (see operator sense 3a) indicated by writing the symbols of two vectors (see vector entry 1 sense 1a) without a dot or cross between (such as AB)

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Other Words from dyad

dyadic \dī-​ˈa-​dik \ adjective
dyadically \-​di-​k(ə-​)lē \ adverb

Examples of dyad in a Sentence

the book examines the doctor-patient dyad from several perspectives

Recent Examples on the Web

The researchers also collected information on pairs of people known to interact with each other—dyads—as well as employee attributes, including gender, role, and desk location. Beth Mole, Ars Technica, "Open offices are as bad as they seem—they reduce face-to-face time by 70%," 13 July 2018 There is a thesis to be written about New York theater of that moment in that dyad of shows, linked by a single actor: Nixon, unwilling to hide the gears turning in her brain with the limbs of her body. New York Times, "The Stars Who Got Their Start on the ’80s New York Stage," 16 Apr. 2018 In international relation dyads, this is a death knell for trust, and soon other nations will be wary of providing information to those hardworking individuals in the intelligence community. Mark Hertling, CNN, "Trump had the right to do it, but should he have?," 16 May 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dyad.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of dyad

1675, in the meaning defined at sense 1

History and Etymology for dyad

Late Latin dyad-, dyas, from Greek, from dyo — see dy-

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Statistics for dyad

Last Updated

14 Nov 2018

Look-up Popularity

Time Traveler for dyad

The first known use of dyad was in 1675

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More Definitions for dyad


variants: also diad \ˈdī-​ˌad, -​əd \

Medical Definition of dyad 

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

Other Words from dyad

dyadic \dī-​ˈad-​ik \ adjective
dyadically \-​i-​k(ə-​)lē \ adverb

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More from Merriam-Webster on dyad

Rhyming Dictionary: Words that rhyme with dyad

Thesaurus: All synonyms and antonyms for dyad

Britannica English: Translation of dyad for Arabic Speakers

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