1. Noun
Two units treated as one; a couple; a pair.
2. Noun
An element, atom, or radical having a valence or combining power of two.
3. Adjective
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.
4. Noun
two items of the same kind
Vocabulary classified under Mathematics
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