1. 
   Caoutchouc
   An early (and unsatisfactory) method of securing single sheets by roughening the spine edges and applying a rubber cement and reinforcing with caoutchouc impregnated cloth. Popular in the middle of the nineteenth century. Possibly a forerunner to our modern perfect binding.
   Found op http://www.encyclo.co.uk/local/20208
   
   
2. 
   Caoutchouc
   Caout'chouc noun [ French caoutchouc , from the South American name.] A tenacious, elastic, gummy substance obtained from the milky sap of several plants of tropical South America (esp. the euphorbiaceous tree Siphonia elastica or Hevea c...
   Found op http://www.encyclo.co.uk/webster/C/19
   
   
3. 
   Caoutchouc
   • (n.) A tenacious, elastic, gummy substance obtained from the milky sap of several plants of tropical South America (esp. the euphorbiaceous tree Siphonia elastica or Hevea caoutchouc), Asia, and Africa. Being impermeable to liquids and gases, and not readly affected by exposure to air, acids,...
   Found op http://thinkexist.com/dictionary/meaning/caoutchouc/
   
   
4. 
   caoutchouc
   caoutchouc (kou'chook) , natural rubber obtained as a latex from various tropical plants, e.g., the Pará rubber tree. It is much more elastic than balata or gutta-percha. It is the most familiar and widely used of the natural rubbers. It is usually processed by coagulating the latex and b...
   Found op http://www.infoplease.com/ce6/sci/A0810262.html
   
   
5. 
   Caoutchouc
   Caoutchouc is an elastic gummy substance, chemically a hydrocarbon, contained in the milky juice of a number of tropical trees of various orders, among the chief being the Siphonia elastica (Hevea elastica) and others of the same genus growing in South America. The name is also used as an equivalent...
   Found op http://www.probertencyclopaedia.com/browse/GC.HTM
   
   
6. 
   caoutchouc
   1) Gum elastic 2) India rubber 3) Latex 4) Rubber
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/caoutchouc/1
   
   

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