Source : Webster's Revised Unabridged Dictionary (1913)

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.

   {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.