- 1. n. Two units treated as one; a couple; a pair. Source: opted
- 2. n. An element, atom, or radical having a valence or combining power of two. Source: opted
- 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. Source: opted
- 4. n. two items of the same kind Source: wordnet
- 5. 1. Two units treated as one; a couple; a pair. 2. (Chem.) An element, atom, or radical having a valence or combining power of two. 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
- 6. An element, atom, or radical having a valence or combiningpower of two. Source: adambom
- 7. n:100 n two items of the same kind Source: ecdict
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valencecombiningpoweratomelementradicalatomscalciumcapablecombinedcoupleelementshydrogenitemskindoxygenpairreplacedseesubstitutedtreatedunits