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Definition of dyad : 1. An element, atom, or radical having a valence or combining power of two.
2. 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.
3. Two units treated as one; a couple; a pair.

Synonyms:

braces, distich, duette, doubleton, twain, bitstock, bracing, pas de deux, suspender, duad, orthodontic braces, gallus, straddle, bridge, coupling, mates

couple, twosome, duet, span, duo, match, yoke, team, pair, two, brace, couplet, doublet

microbe, germ, rotifer, protozoa, paramecium, animalcule, microorganism, amoeba, mastigopod, micrococcus, zoospore, microspore, microphyte, bacillus, zygote, rhizopod, virus, bacteria