DYAD

n. a.

3 definitions — Webster’s Dictionary (1828)

1.
n.

Two units treated as one; a couple; a pair.

2.
n.

An element, atom, or radical having a valence or combining power of two.

3.
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.

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