3 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
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.
2. (Chem.) An element, atom, or radical having a valence or
combining power of two
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
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}.
From WordNet r 1.6 [wn]:
dyad
n : two items of the same kind [syn: {couple}, {doubleton}, {pair},
{twosome}, {twain}, {brace}, {span}, {yoke}, {couplet},
{distich}, {duo}, {duet}, {duad}]
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