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

 

eco-

 combining form
combining form
BrE BrE//ˈiːkəʊ//
 
; NAmE NAmE//ˈiːkoʊ//
 
 
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(in nouns, adjectives and adverbs) connected with the environment eco-friendly eco-warriors (= people who protest about damage to the environment) eco-terrorism (= the use of force or violent action in order to protest about damage to the environment)
See the Oxford Advanced American Dictionary entry: eco-