1. 
   grain boundary
   A narrow zone in a metal corresponding to the transition from one crystallographic orientation to another, thus separating one grain from another; the atoms in each grain are arranged in an orderly pattern; the irregular junction of two adjacent grains is known as a grain boundary.
   Found op http://www.encyclo.co.uk/local/20742
   
   
2. 
   grain boundary
   (from the article `ice in lakes and rivers`) ...the similarity of deteriorating ice crystals to an assembly of closely packed candles, is caused by the absorption of solar radiation. When energy ...
   Found op http://www.britannica.com/eb/a-z/g/56
   
   
3. 
   Grain boundary
   A grain boundary is the interface between two grains, or crystallites, in a polycrystalline material. Grain boundaries are defects in the crystal structure, and tend to decrease the electrical and thermal conductivity of the material. The high interfacial energy and relatively weak bonding in most ...
   Found op http://en.wikipedia.org/wiki/Grain_boundary
   
   
4. 
   grain boundary
   A narrow zone in a metal corresponding to the transition from one crystallographic orientation to another, thus separating one grain from another; the atoms in each grain are arranged in an orderly pattern; the irregular junction of two adjacent grains is known as a grain boundary
   Found op http://www.encyclo.co.uk/local/21115
   
   

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