osmoregulator
/ˌɒzmə(ʊ)ˈrɛɡjʊleɪtə/Physiology
noun
A part of the body or a substance involved in osmoregulation; an organism capable of osmoregulation.
Origin
1930s; earliest use found in Biological Reviews. From osmo- + regulator, after osmoregulatory, osmoregulation.