milieu interieur

noun
mi·​lieu in·​te·​ri·​eur | \mēl-ˈyœ̅-aⁿ-tā-rē-ˈœr \

Medical Definition of milieu interieur 

: the bodily fluids regarded as an internal environment in which the cells of the body are nourished and maintained in a state of equilibrium

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