DUAD
couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duad
(noun) two items of the same kind
Source: WordNet® 3.1
Noun
duad (plural duads)
A pair or couple.
Synonyms: dyad, twosome, Thesaurus:duo
(astrology) Dwadasamsa.
(mathematics) An unordered pair.
Coordinate terms
• monad · duad, dyad · triad · tetrad · pentad · hexad · heptad · octad · ennead, nonad · decad, decade · hendecad · dodecad, duodecade
Anagrams
• Dadu, Duda, daud, udad
Source: Wiktionary
Du"ad, n. Etym: [See Dyad.]
Definition: A union of two; duality. [R.] Harris.
Source: Webster’s Unabridged Dictionary 1913 Edition