1. 
   closed chain
   [n] - (chemistry) a chain of atoms in a molecule that forms a closed loop
   Found op http://www.webdictionary.co.uk/definition.php?query=closed%20chain
   
   
2. 
   closed chain
   ring noun (chemistry) a chain of atoms in a molecule that forms a closed loop
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=closed%20chain
   
   
3. 
   closed chain
   several atoms linked together so as to form a ring, which may be saturated, as in cyclopentane, or aromatic, as in benzene. See illustration at chain.
   Found op http://www.encyclo.co.uk/local/21001
   
   
4. 
   closed-chain
   [adj] - having atoms linked by bonds represented in circular or triangular form
   Found op http://www.webdictionary.co.uk/definition.php?query=closed-chain
   
   
5. 
   closed-chain
   closed-ring adjective having atoms linked by bonds represented in circular or triangular form
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=closed-chain
   
   

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