oligomer
substance composed of oligomer molecules
dimer
oligomer consisting of two structurally similar monomers joined by bonds that can be either strong or weak, covalent or intermolecular
pentamer
molecule made of five monomers
tetramer
oligomer formed from four monomers or subunits
paraformaldehyde
oligomer or short polymer of formaldehyde
trimer
chemical term for a product derived from three monomers