1. To treat (a pathogen or foreign particle) with opsonin, a substance that enhances its recognition and destruction by immune cells.
Usage: chiefly British spelling; American spelling is 'opsonize'; technical/medical term; transitive verb

Examples

• The antibodies opsonise the bacteria, marking them for destruction by white blood cells.
• Complement proteins opsonise pathogens to facilitate phagocytosis.
• The immune system opsonises foreign antigens to enhance their clearance.
• Opsonised particles are more readily engulfed by macrophages.
• The serum was used to opsonise the microorganisms before the experiment.