The story
From counter- + immunoelectrophoresis.
Etymology from Wiktionary, CC BY-SA 4.0.
counterimmunoelectrophoresis
Today it means: A laboratory technique used to evaluate the binding of an antibody to its antigen, similar to immunodiffusion, but with the addition of an applied electrical field across the diffusion medium, usually an agar or polyacrylamide gel. Full definition →