Hypertext Webster Gateway: "pentad"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pentad \Pen"tad\, n. [Gr. ?, ?, a body of five, fr. ? 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.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pentad \Pen"tad\, a. (Chem.)
Having the valence of a pentad.
From WordNet (r) 1.7 (wn)
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}]
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