01 n. Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hy…
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1.
Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.(Chem.)
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2.
Any grouping of five things.