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From: Webster's Revised Unabridged Dictionary (1913)

 Pro·to·met·als 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. -- Pro*to*me*tal*ic a.
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