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Dyad is a 4 letter word which starts with the letter D and ends with the letter D for which we found 3 definitions.

(n.) Two units treated as one; a couple; a pair.
(n.) An element atom or radical having a valence or combining power of two.
(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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