Definitions of base metal:
- noun: (chemistry) Any metal at the lower end of the electrochemical series that oxidizes readily.
- noun: (metallurgy) The metal to be welded (rather than that used to weld).
- noun: A common or inexpensive metal.
- noun: (chiefly alchemy) one that was hoped to be transmuted into a precious metal.
(Definitions from Wiktionary)
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