milieu intérieur
/ˈmiːljəː ãtɛːrɪˈəː/ /mɪlˈjəː ãtɛːrɪˈəː/(also milieu interieur) Physiology
noun
The extracellular fluid forming the environment of cells in a multicellular organism.
Origin
Early 20th century; earliest use found in Science. From French milieu intérieur from milieu + intérieur.