01 n. Two units treated as one; a couple; a pair.
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1.
Two units treated as one; a couple; a pair.
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2.
An element, atom, or radical having a valence or combining power of two.(Chem.)
Entry
3 senses · 2 variants
Webster, 1913
Dyad
02 a. Having a valence or combining power of two; capable of being substituted for, combined with, or replaced by, two atoms of hydrogen; as, oxy…
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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.(Chem.) See: Valence