- The definition of a dispersing agent is a chemical that is added to an oil, cement or another liquid to prevent it from hardening or clumping.
An example of a dispersing agent is the ingredient added to gasoline to keep it from leaving behind a sticky residue.
dispersing agent definition by Webster's New World
Chem. a surface-active substance added to a suspension, usually a colloid, to improve the separation of particles and to prevent settling or clumping