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CIDE DICTIONARY

protometals

CIDE DICTIONARY

protometalsn. 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.  [Webster 1913 Suppl.]

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