dyad
/ˈdaɪ.æd/ noun
Forms dyads
- noun A set of two elements treated as one; a pair.
- noun (sociology) Two persons in an ongoing relationship; a dyadic relationship.
- noun (sociology) The relationship or interaction itself in reference to a couple.
- noun (music) Any set of two different pitch classes.
- noun (chemistry) An element, atom, or radical having a valence of or combining power of two.
- noun (biology) A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
- noun (biology) A secondary unit of organisation consisting of an aggregate of monads.
- noun (mathematics) A tensor of order two and rank one.
Synonyms
couple duad brace couplet doublet duet duo duplet pair twain twosome twinsome span yoke distich
Etymology
From Ancient Greek δυάς (duás), δυάδ- (duád-) from δύο (dúo, “two”), from Proto-Indo-European *duwó, *duwéh₃ (*dwóh₁). The mathematics sense was coined by American scientist Josiah Willard Gibbs in 1884 in the second half of his book Elements of Vector Analysis.
Webster’s 1913
- noun Two units treated as one; a couple; a pair.
- noun An element, atom, or radical having a valence or combining power of two.
- adjective Having a valence or combining power of two; capable of being substituted for, combined with, or replaced by, two atoms of hydrogen; as, oxygen and calcium are dyad elements. See Valence.
Etymology [L. dyas, dyadis, the number two. Gr. dyade. See two, and cf. Duad.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “dyad”, CC BY-SA 4.0. Details