The Collaborative International Dictionary of English v.0.48:

Cronian \Cro"ni*an\ (kr[=o]"n[i^]*an), a. [Gr. Kro`nios
   Saturnian, fr. Kro`nos Saturn.]
   Saturnian; -- applied to the North Polar Sea. [R.] --Milton.
   [1913 Webster]