Real Dictionary

polymer
countable noun: A polymer is a chemical compound with large molecules made of many smaller molecules of the same kind. Some polymers exist naturally and others are produced in laboratories and factories.

polymer in American English
a naturally occurring or synthetic substance consisting of giant molecules formed from polymerization
noun: a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller molecules with the elimination of water, alcohol, or the like, as nylon

polymer in British English
noun: a naturally occurring or synthetic compound, such as starch or Perspex, that has large molecules made up of many relatively simple repeated units

polymer in Chemical Engineering
noun: A polymer is a type of organic solid which has a very large molecular structure.

polymer in Mechanical Engineering
noun: A polymer is a type of organic solid (= a solid that is a compound of carbon or hydrogen) that has a very large molecular structure.