Monomer

Imagine trying to build a long, sturdy chain with individual paper clips. Just like each paper clip connects to form a chain, a monomer is a small molecule that links with others to form a polymer chain. Each paper clip represents a monomer, and when you connect enough paper clips together, they form a long chain, just as monomers connect to form a polymer, creating something much larger and more complex from simple, repeated units.
Practice Version

Monomer: A small molecule that makes up a polymer chain monomer. A monomer is a basic unit that joins with others to form a larger structure called a polymer.