chemocline
/ˈkiːmə(ʊ)klʌɪn/ /ˈkɛmə(ʊ)klʌɪn/Limnology
noun
A distinct boundary zone in a body of water, marked by a steep concentration gradient, separating layers of water with different chemical compositions or concentrations.
Origin
1930s; earliest use found in George Hutchinson (b. 1903). From chemo- + -cline.