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eco

[ek-oh, ee-koh]Informal.
adjective
  1. ecological or environmental.
  2. not harmful to the environment: an eco resort with no air conditioning.
noun
  1. ecology.

Eco

[ek-oh; Italian e-kaw]
noun
  1. Umberto,born 1932, Italian novelist and philosopher.

eco-

  1. a combining form representing ecology in the formation of compounds (ecosystem; ecotype); also with the more general sense “environment,” “nature,” “natural habitat” (ecocide; ecolaw; ecopolitics).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for eco

eco

noun
    1. short for ecology
    2. (as modifier)an eco group

Eco

noun
  1. Umberto. born 1932, Italian semiologist and writer. His novels include The Name of the Rose (1981) and Foucault's Pendulum (1988)

eco-

combining form
  1. denoting ecology or ecologicalecocide; ecosphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for eco

eco-

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

Online Etymology Dictionary, © 2010 Douglas Harper
eco in Medicine

eco-

pref.
  1. Ecology; ecological:ecosystem.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.