Heptad \Hep"tad\, n. [L. heptas the number seven. Gr. ?, ?, fr.
"epta` seven.] (Chem.)
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]
The Collaborative International Dictionary of English v.0.48
heptad
n : the cardinal number that is the sum of six and one [syn: seven,
7, VII, sevener, septet]
WordNet (r) 2.0
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