noun Ecology.
a complex biotic community characterized by distinctive plant and animal species and maintained under the climatic conditions of the region, especially such a community that has developed to climax.

1915–20; bi-2 + -ome -oma Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biome (ˈbaɪˌəʊm)
See formation a major ecological community, extending over a large area and usually characterized by a dominant vegetation
[C20: from bio- + -ome]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1916, from Gk. bios (see bio-) + -ome.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

biome bi·ome (bī'ōm')
The total complex of biotic communities occupying and characterizing a particular area or zone, such as a desert or deciduous forest.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
biome   (bī'ōm')  Pronunciation Key 
A large community of plants and animals that occupies a distinct region. Terrestrial biomes, typically defined by their climate and dominant vegetation, include grassland, tundra, desert, tropical rainforest, and deciduous and coniferous forests. There are two basic aquatic biomes, freshwater and marine, which are sometimes further broken down into categories such as lakes and rivers or pelagic, benthic, and intertidal zones.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Not all scientists classify biomes in the same way.
The darkest reaches of the ocean have long been thought of as a desolate biome.
As vessels around the world drag nets and dredges across the seabed, they
  slowly destroy the biome.
They called their newly-defined areas “anthromes,” short for
  anthropological biomes.
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