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Definition of -i-
1. Interfix. (qualifier in coining neologisms) A vowel inserted interconsonantally between morphemes of Latinate origin in order to ease pronunciation (an anaptyxis, a linking vowel). ¹
2. Affix. (pharmacology) a monoclonal antibody derived from a non-human primate source ¹
¹ Source: wiktionary.com