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Longman Dictionary of Contemporary English

eco-

prefix
EXAMPLES FROM OTHER ENTRIES
eco-education
eco-friendly agriculture
eco-toys
▪ Activist want the government to invest in low-impact eco-tourist facilities.
▪ Officials see a role for sophisticated eco-technology to help eradicate pollution sweeping across the region.
Douglas Harper's Etymology Dictionary

eco-

word-forming element referring to the environment and man's relation to it, abstracted from ecology, ecological; attested from 1969.

Wiktionary

eco-

pre. 1 ecology or the environment (in the ecological sense) 2 economy