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English definition of “combining form”

combining form

noun [C]  /kəmˈbɑɪ·nɪŋ ˌfɔrm/ us  
grammar a word part to which prefixes and word endings or other combining forms can be added to make a word, as "bio-," "-graphy," and "-logy" combine to make "biology" and "biography"
(Definition of combining form from the Cambridge Academic Content Dictionary © Cambridge University Press)
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