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eco

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

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

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

combining form
  1. denoting ecology or ecologicalecocide; ecosphere
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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.

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Online Etymology Dictionary, © 2010 Douglas Harper

eco in Medicine

eco-

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