scrap iron

scrap iron
    n 1: iron to be melted again and reworked
    

Scrap \Scrap\ (skr[a^]p), n. [OE. scrappe, fr. Icel. skrap
   trifle, cracking. See {Scrape}, v. t.]
   1. Something scraped off; hence, a small piece; a bit; a
      fragment; a detached, incomplete portion.
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            I have no materials -- not a scrap.   --De Quincey.
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   2. Specifically, a fragment of something written or printed;
      a brief excerpt; an unconnected extract.
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   3. pl. The crisp substance that remains after drying out
      animal fat; as, pork scraps.
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   4. pl. Same as {Scrap iron}, below.
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   {Scrap forgings}, forgings made from wrought iron scrap.

   {Scrap iron}.
      (a) Cuttings and waste pieces of wrought iron from which
          bar iron or forgings can be made; -- called also
          {wrought-iron scrap}.
      (b) Fragments of cast iron or defective castings suitable
          for remelting in the foundry; -- called also {foundry
          scrap}, or {cast scrap}.
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41 Moby Thesaurus words for "scrap iron":
      bones, chaff, culm, deadwood, dishwater, draff, dregs, dust,
      filings, garbage, gash, hogwash, husks, leavings, lees, offal,
      offscourings, orts, parings, potsherds, rags, raspings, refuse,
      scourings, scraps, scum, shards, shavings, slack, slag, slop,
      slops, stubble, sweepings, swill, tares, wastage, waste,
      waste matter, wastepaper, weeds