The Collaborative International Dictionary of English v.0.48:

Melting \Melt"ing\, n.
   Liquefaction; the act of causing (something) to melt, or the
   process of becoming melted.
   [1913 Webster]

   Melting point (Chem.), the degree of temperature at which a
      solid substance melts or fuses; as, the melting point of
      ice is 0[deg] Centigrade or 32[deg] Fahr., that of urea is
      132[deg] Centigrade. Pressure affects the melting point
      somewhat, and if not specified the melting point is
      usually taken to be at atmospheric pressure.
      [1913 Webster]

WordNet (r) 3.0 (2006):

melting point
    n 1: the temperature below which a liquid turns into a solid
         [syn: freezing point, melting point]