DYADS
Noun
dyads
plural of dyad
Anagrams
• D-Days, Dadys
Source: Wiktionary
DYAD
Dy"ad, n. Etym: [L. dyas, dyadis, the number two. Gr. dyade. See two,
and cf. Duad.]
1. Two units treated as one; a couple; a pair.
2. (Chem.)
Definition: An element, atom, or radical having a valence or combining
power of two.
Dy"ad, a. (Chem.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition