base metal
nounDefinition of base metal
1
: a metal or alloy (such as zinc, lead, or brass) of comparatively low value and relatively inferior in certain properties (such as resistance to corrosion)
—opposed to noble metal
2
: the metal to which a coating or plating is applied : the metal existing underneath a coating or plating
3
: the chief constituent of any alloy
4
: the metal composing parts to be welded
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