Definition of bio- combining form from the Oxford Advanced Learner's Dictionary

 

bio-

 combining form
combining form
BrE BrE//ˈbaɪəʊ//
 
; NAmE NAmE//ˈbaɪoʊ//
 
 
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(in nouns, adjectives and adverbs) connected with living things or human life biodegradable biography Word Originfrom Greek bios ‘(course of) human life’. The sense is extended in modern science to mean ‘organic life’.
See the Oxford Advanced American Dictionary entry: bio-