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heppelwhite | heppen | hepper | hepta | heptachord | heptad | heptade | heptadecanoic acid | heptaglot | heptagon | heptagonal

heptad

 : 
Noun
 : 
hep=tad

CIDE DICTIONARY

heptadn. [L. heptas the number seven. Gr. , , fr. "epta` seven.].
     An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.  [1913 Webster]

OXFORD DICTIONARY

heptad, n. a group of seven.

Etymology
Gk heptas -ados set of seven (hepta)

For further exploring for "heptad" in Webster Dictionary Online


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