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

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

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..

Bivalent :: Bivalent (p. pr.) Equivalent in combining or displacing power to two atoms of hydrogen; dyad.

Valence :: Valence (n.) The degree of combining power of an atom (or radical) as shown by the number of atoms of hydrogen (or of other monads, as chlorine, sodium, etc.) with which it will combine, or for which it can be substituted, or with which it can be compared; thus, an atom of hydrogen is a monad, and has a valence of one; the atoms of oxygen, nitrogen, and carbon are respectively dyads, triads, and tetrads, and have a valence respectively of two, three, and four..

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

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