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Definition of Pentakis-
1. Prefix. (mathematics) A variant of penta-, used for multiplication with a second numerical prefix. ¹
2. Prefix. (chemistry) A variant of penta-, used for substitutions of five complex rather than simple units: '''pentakis'''(phenylthio)pyridine, or to distinguish five simple substituents from a single polymer of five units ¹
¹ Source: wiktionary.com