osmoregulate
/ˌɒzmə(ʊ)ˈrɛɡjʊleɪt/Physiology
verb
[no object] To regulate the body's content of water and solutes; to maintain the osmotic concentration of body fluids at a constant level or within certain limits.
Origin
1950s; earliest use found in Journal of Experimental Biology. From osmo- + regulate, after osmoregulating.