英和和英

語源

From duo- +‎ -ad.

名詞

duad (plural duads)

1. A pair or couple.

   Synonyms: dyad, twosome; see also Thesaurus:duo

   • 1876, Richard F[rancis] Burton, “The Minor Tribes and the Mpongwe”, in Two Trips to Gorilla Land and the Cataracts of the Congo. […], part I (The Gaboon River and Gorilla Land), London: Sampson Low, Marston, Low, and Searle, […], →OCLC, page 96:

     [T]hey have invented idols, a manifest advance toward that polytheism and pantheism which lead through a triad and duad of deities to monotheism, the finial of the spiritual edifice.

2. (astrology) Dwadasama.
3. (mathematics) An unordered pair.

等位語

• (group) monad, duad/dyad, triad, tetrad, pentad, hexad, hebdomad/heptad, ogdoad/octad, ennead/nonad, decad/decade, hendecad, dodecad/duodecade, chiliad

派生語

アナグラム

• Dadu, Duda, daud, udad