dross /ˈdrɑs, ˈdrɔs/
 浮渣,碎屑,渣滓


 Dross n.
 1. The scum or refuse matter which is thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement.
 2. Rust of metals. [R.]
 3. Waste matter; any worthless matter separated from the better part; leavings; dregs; refuse.
    All world's glory is but dross unclean.   --Spenser.
 At the devil's booth are all things sold,
 Each ounce of dross coats its ounce of gold.   --Lowell.

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 dross
      n 1: worthless material that should be removed; "there were
           impurities in the water" [syn: impurity]
      2: the scum formed by oxidation at the surface of molten metals
         [syn: slag, scoria]


 Dross
    the impurities of silver separated from the one in the process
    of melting (Prov. 25:4; 26:23; Ps. 119:119). It is also used to
    denote the base metal itself, probably before it is smelted, in
    Isa. 1:22, 25.