Dyad :: Dyad (n.) Two units treated as one; a couple; a pair.

Dyad :: Dyad (n.) An element, atom, or radical having a valence or combining power of two..

Dyad :: Dyad (a.) 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..

Dyadic :: Dyadic (a.) Pertaining to the number two; of two parts or elements.

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