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octad

[ok-tad] /ˈɒk tæd/
noun
1.
a group or series of eight.
2.
Chemistry. an element, atom, or group having a valence of eight.
Origin
1835-1845
1835-45; < Greek oktad- (stem of oktás) group of eight, equivalent to okt- oct- + -ad -ad1
Related forms
octadic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for octad

octad

/ˈɒktæd/
noun
1.
a group or series of eight
2.
(chem) an element or group with a valency of eight
Derived Forms
octadic, adjective
Word Origin
C19: from Greek oktās, from oktō eight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Value for octad

8
9
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