Pentad \Pen"tad\, n. [Gr. penta`s penta`dos, a body of five, fr.
pe`nte five.] (Chem.)
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.
[1913 Webster]
2. Any grouping of five things.
[PJC]
The Collaborative International Dictionary of English v.0.48
Pentad \Pen"tad\, a. (Chem.)
Having the valence of a pentad.
[1913 Webster] Pentadactyl
The Collaborative International Dictionary of English v.0.48
pentad
n : the cardinal number that is the sum of four and one [syn: five,
5, V, cinque, quint, quintet, fivesome, quintuplet,
fin, Phoebe, Little Phoebe]
WordNet (r) 2.0
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