Bible Dictionaries
Ceruleum

Webster's Dictionary

(n.) A greenish blue pigment prepared in various ways, consisting essentially of cobalt stannate. Unlike other cobalt blues, it does not change color by gaslight.

Bibliography Information
Webster, Noah. Entry for 'Ceruleum'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​c/ceruleum.html. 1828.