Water polo team, e.g

• Jazzy septet?
• The seas, e.g
• Snow White's Dwarfs, e.g.
• The seas, e.g.
• Any group of seven
• The cardinal number that is the sum of six and one
• Group of seven in gym detained by principal

WordNet Word definitions in WordNet
n. the cardinal number that is the sum of six and one [syn: seven , 7 , VII , sevener , septet ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...