polymer pol·y·mer (pŏl'ə-mər)
n.
Any of numerous compounds of usually high molecular weight and consisting of up to millions of repeated linked units, each a relatively light and simple molecule.
In chemistry, a long molecule made up of a chain of smaller, simpler molecules.
Note: Proteins and many carbohydrates, such as cellulose, are polymers. Plastics are also polymers.