physiological atmosphere

noun Unabridged


[ek-oh-sfeer, ee-koh-]
Also called physiological atmosphere. the part of the atmosphere in which it is possible to breathe normally without aid: the portion of the troposphere from sea level to an altitude of about 13,000 feet (4000 meters).
Ecology. the planetary ecosystem, including all the earth's living organisms and their physical environment; biosphere.

1950–55; eco- + sphere Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ecosphere (ˈiːkəʊˌsfɪə, ˈɛkəʊ-)
the planetary ecosystem, consisting of all living organisms and their environment

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ecosphere   (ē'kō-sfîr')  Pronunciation Key 
The regions of the Earth that are capable of supporting life, together with the ecosystems they contain; the biosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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