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Meaning of octa-

octa-

Pronunciation: [key]
  1. a combining form occurring in loanwords from Greek and Latin, where it meant “eight” (octagon; octastyle), on this model, used in the formation of compound words, and in chemical terms specialized to mean “having eight atoms” (octavalent).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.