Hypertext Webster Gateway: "octo"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Octo- \Oc"to-\, Octa- \Oc"ta-\ [L. octo eight, Gr. ?, with a
combining form ?. Cf.{Eight}.]
A combining form meaning eight; as in octodecimal,
octodecimal, octolocular.
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