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The Collaborative International Dictionary
Octad

Octad \Oc"tad\, n. [Gr. ?, ?, the number eight.]

  1. (Chem.) An atom or radical which has a valence of eight, or is octavalent.

  2. A group of eight things.

Wiktionary
octad

n. A group of eight things

WordNet
octad

n. the cardinal number that is the sum of seven and one [syn: eight, 8, VIII, eighter, eighter from Decatur, ogdoad, octonary, octet]

Usage examples of "octad".

The interstellar drive had yet to be run continuously for years and whole octads on end.