microenvironment Syllabification: (mi·cro·en·vi·ron·ment)Pronunciation: /ˌmīkrōinˈvīrə(n)mənt, -ˈvī(ə)r(n)mənt/Definition of microenvironment noun Biology the immediate small-scale environment of an organism or a part of an organism, especially as a distinct part of a larger environment. Derivatives microenvironmentalPronunciation: /-ˌvīrə(n)ˈmentl, -ˌvī(ə)r(n)-/ adjective microenvironment in other Oxford dictionaries Definition of microenvironment in the British & World English dictionary