Sinter

from WordNet (r) 3.0 (2006)

sinter
    v 1: cause (ores or powdery metals) to become a coherent mass by
         heating without melting

from The Collaborative International Dictionary of English v.0.48

Sinter \Sin"ter\, n. [G. Cf. {Cinder}.] (Min.)
   Dross, as of iron; the scale which files from iron when
   hammered; -- applied as a name to various minerals.
   [1913 Webster]

   {Calcareous sinter}, a loose banded variety of calcite formed
      by deposition from lime-bearing waters; calcareous tufa;
      travertine.

   {Ceraunian sinter}, fulgurite.

   {Siliceous sinter}, a light cellular or fibrous opal;
      especially, geyserite (see {Geyserite}). It has often a
      pearly luster, and is then called pearl sinter.
      [1913 Webster] Sintoism
      Sintu
      Sinto