Polyad
The Century Dictionary and Cyclopedia
noun.
In
chem.
, an element whose valence or quantivalence is greater than two, as a triad, tetrad, hexad, etc.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A group consisting of an
indeterminate
number of things or people.
cross-reference
decad
dyad
group
heptad
hexad