Definitions for octadˈɒk tæd
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Random House Webster's College Dictionary
oc•tadˈɒk tæd(n.)
a group or series of eight.
Category: Math
an element, atom, or group having a valence of eight.
Category: Chemistry
Origin of octad:
1835–45; < Gk oktad- (s. of oktás) group of eight =okt(ṓ)eight+-ad -ad1
oc•tad′ic(adj.)
Princeton's WordNet
eight, 8, VIII, eighter, eighter from Decatur, octad, ogdoad, octonary, octet(noun)
the cardinal number that is the sum of seven and one
Wiktionary
octad(Noun)
a group of eight things
Citation
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