Monomer
Molecule which reacts with other monomers to form a polymer / From Wikipedia, the free encyclopedia
A monomer (/ˈmɒnəmər/ MON-ə-mər; mono-, "one" + -mer, "part") is a molecule that can react together with other monomer molecules to form a larger polymer chain or three-dimensional network in a process called polymerization.[1][2][3]
IUPAC definition
Monomer molecule: A molecule which can undergo polymerization, thereby contributing constitutional units to the essential structure of a macromolecule.[4]