1. 
   Glass Ceramic
   A fine-grained crystalline material that was formed as a glass and subsequently devitrified (crystallized). See also: Ceramic.
   Found op http://www.diracdelta.co.uk/science/source/g/l/glass%20ceramic/source.html
   
   
2. 
   glass ceramic
   any of a number of forms of crystallized glass having a variety of properties and uses, including the manufacture of dental restorations; formed by heating to the point of crystallization an amorphous glass matrix to which impurities have been added to provide nuclei for crystal formation.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   Glass-ceramic
   a fine-grained crystalline material that was formed as a glass and subsequently devitrified (crystallized).
   Found op http://www.tulane.edu/~bmitche/book/glossary.html
   
   
4. 
   Glass-ceramic
   Glass-ceramics are polycrystalline material produced through controlled crystallization of base glass. Glass-ceramic materials share many properties with both glasses and ceramics. Glass-ceramics have an amorphous phase and one or more crystalline phases and are produced by a so called "controlled ...
   Found op http://en.wikipedia.org/wiki/Glass-ceramic
   
   

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