'Heptad' definitions:

Definition of 'heptad'

From: WordNet
noun
The cardinal number that is the sum of six and one [syn: seven, 7, VII, sevener, heptad, septet, septenary]

Definition of 'Heptad'

From: GCIDE
  • 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]

Words containing 'Heptad'