Bible Dictionaries
Protometals

Webster's Dictionary

(n. pl.) A finer form of metals, indicated by enhanced lines in their spark spectra (which are also observed in the spectra of some stars), obtained at the highest available laboratory temperatures (Lockyer); as protocalcium, protochromium, protocopper, protonickel, protosilicon, protostrontium, prototitanium, protovanadium.

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