1. cause (ores or powdery metals) to become a coherent mass by heating without melting;
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.
Calcareous sinter, a loose banded variety of calcite formed
by deposition from lime-bearing waters; calcareous tufa;
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
WordNet (r) 3.0 (2006):
v 1: cause (ores or powdery metals) to become a coherent mass by
heating without melting