English dictionary
protometals
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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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 (<i>Lockyer</i>); as protocalcium, protochromium, protocopper, protonickel, protosilicon, protostrontium, prototitanium, protovanadium.
Source: webster1913