English dictionary
pentad
/'p/E/nt/&/d/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
adjective
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Having the valence of a pentad.
Source: webster1913
noun
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the cardinal number that is the sum of four and one
Source: WordNet 3.0
-
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 <i>pentad</i> in the ammonium compounds.
Source: webster1913