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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.
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.
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