A monomer is a molecule of any of a group of compounds, most of which are organic, that has the ability to react with other molecules to form polymers, or very large molecules. Polyfunctionality, or the capacity to form chemical bonds with at least two other monomer molecules, is the most important characteristic of a monomer. High-Quality Herb Extracts & Monomers can frame just straight, chainlike polymers, yet monomers of higher usefulness yield cross-connected, network polymeric items.