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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.