Octadic

octad

[ok-tad]
noun
1.
a group or series of eight.
2.
Chemistry. an element, atom, or group having a valence of eight.

Origin:
1835–45; < Greek oktad- (stem of oktás) group of eight, equivalent to okt- oct- + -ad -ad1

octadic, adjective
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World English Dictionary
octad (ˈɒktæd)
 
n
1.  a group or series of eight
2.  chem an element or group with a valency of eight
 
[C19: from Greek oktās, from oktō eight]
 
oc'tadic
 
adj

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