[mahy-kroh-en-vahy-ern-muhnt, -vahy-ruhn-]
the environment of a small area or of a particular organism; microhabitat.

1950–55; micro- + environment

microenvironmental [mahy-kroh-en-vahy-ern-men-tl, -vahy-ruhn-] , adjective
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World English Dictionary
microenvironment (ˈmaɪkrəʊɪnˌvaɪrənmənt)
ecology the environment of a small area, such as that around a leaf or plant

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
microenvironment   (mī'krō-ěn-vī'rən-mənt)  Pronunciation Key 
The environment of a very small, specific area, distinguished from its immediate surroundings by such factors as the amount of incident light, the degree of moisture, and the range of temperatures. The side of a tree that is shaded from sunlight is a microenvironment that typically supports a somewhat different community of organisms than is found on the side that receives regular light. Also called microhabitat.
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