'Dyad' definitions:

Definition of 'dyad'

From: WordNet
noun
Two items of the same kind [syn: couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duad]

Definition of 'Dyad'

From: GCIDE
  • Dyad \Dy"ad\, n. [L. dyas, dyadis, the number two. Gr. ?: cf. F. dyade. See two, and cf. Duad.]
  • 1. Two units treated as one; a couple; a pair. [1913 Webster]
  • 2. (Chem.) An element, atom, or radical having a valence or combining power of two. [1913 Webster]

Definition of 'Dyad'

From: GCIDE
  • Dyad \Dy"ad\, a. (Chem.) 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. [1913 Webster]

Synonyms of 'dyad'

From: Moby Thesaurus