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Definition of Octakis-
1. Prefix. (mathematics) A variant of octo-, used for multiplication with a second numerical prefix: '''octakis'''hexahedron ¹
2. Prefix. (chemistry) A variant of octo-, used for substitutions of eight complex rather than simple units: '''octakis'''(dimethylamino)tetraphosphonitrile ¹
¹ Source: wiktionary.com