homoiosmotic

adjective

ho·​moi·​os·​mot·​ic ˌhō-ˌmȯi-äz-ˈmät-ik 

: having a bodily osmotic regulating mechanism and body fluids that differ in osmotic pressure from the surrounding medium or from seawater

homoiosmotic animals include all the land and freshwater vertebrates

compare poikilosmotic