What does oligomer mean?
An oligomer is a chemical substance made from a relatively small number of repeating building blocks called monomers. It occupies an intermediate position between a monomer, which is a single molecule, and a polymer, which contains many repeating units. Oligomers can have linear, branched, or cyclic structures, and their properties depend on the number and arrangement of their constituent units. They are important in fields such as polymer chemistry, pharmaceuticals, biochemistry, and materials science, where short-chain molecules may be studied for their reactivity, solubility, or ability to assemble into larger structures. The term is also used in contexts involving oligonucleotides, including short chains of DNA or RNA molecules. Although “oligomer” and “polymer” both describe substances built from repeated units, the former generally emphasizes a comparatively short chain or a limited number of repeating units. Its name reflects this idea: the word combines Greek roots meaning “few” and “part.”
nounA chemical compound or material consisting of a relatively small number of monomer units, typically smaller than a polymer but larger than a single monomer.
- A chemical compound or material composed of a small number of repeating monomer units.
"The reaction produced a mixture of oligomers with varying chain lengths."
"Scientists characterized the oligomer by mass spectrometry and nuclear magnetic resonance spectroscopy."
"The catalyst promotes the rapid conversion of the monomer into cyclic oligomers."
The plural is formed by adding -s.
"The researchers isolated several stable oligomers from the reaction mixture."
An oligomer is the chemical middle ground: a few building blocks joined together, but not enough to form a full polymer chain.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does oligomer come from?
The word was formed in the early 20th century from Greek oligos, meaning “few” or “little,” and meros, meaning “part.” The combining form oligo- was already used in scientific terminology for relatively small numbers of units, as in oligosaccharide. In chemistry, oligomer came to designate a substance intermediate in size between a monomer and a polymer.
Related word forms
How oligomer is actually used
Primarily a formal scientific term, especially used in chemistry, biochemistry, materials science, and polymer research. The boundary between an oligomer and a polymer is sometimes defined by convention rather than by a single universally fixed number of monomer units.
Easily confused with oligomer
A monomer is a single building-block molecule, whereas an oligomer contains several monomer units joined together.
An oligomer is a relatively short chain of repeating units, while a polymer generally consists of many more such units.