dross
1.
(
noun
) worthless material that should be removed; "there were impurities in the water"
Synonyms:
impurity
Related Words:
waste
,
waste material
,
waste matter
,
waste product
2.
(
noun
) the scum formed by oxidation at the surface of molten metals
Synonyms:
scoria
,
slag
Related Words:
basic slag
,
scum
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