RhymeZone: confix definitions

Definitions of confix:

noun: (linguistics) An affix consisting of a prefix and suffix affixed simultaneously to the root
noun: (linguistics, rare) An affix which is not divided, and which does not divide a root: thus, a prefix, suffix, or interfix
verb: (obsolete) To make firm; to fix in a particular place or state

(Definitions from Wiktionary)