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Definition of Heptakis-
1. Prefix. (mathematics) A variant of hepta-, used for multiplication with a second numerical prefix. ¹
2. Prefix. (chemistry) A variant of hepta-, used for substitutions of seven complex rather than simple units: '''heptakis'''-(3-O-methyl-2,6-di-O-pentyl)-?-cyclodextrin ¹
¹ Source: wiktionary.com