From The Collaborative International Dictionary of English v.0.48 [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]
From The Collaborative International Dictionary of English v.0.48 [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]
From WordNet (r) 3.0 (2006) [wn]:
dyad
n 1: two items of the same kind [syn: {couple}, {pair},
{twosome}, {twain}, {brace}, {span}, {yoke}, {couplet},
{distich}, {duo}, {duet}, {dyad}, {duad}]
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