In the molecular world, the small subunits that ultimately link together to form larger molecules are called monomers, which literally means "single unit" (mono = one). When a bunch of monomers join together into a much larger molecule, they form apolymer, meaning "many units" (poly = many).
Reference site: www.shmoop.com/biomolecules/monomers-polymers-dehydration-synthesis.html
