The story
From arbitrary prefix to- + -ci- (“cardiovascular”) + -li- (“immunomodulating”) + -zumab (“humanized monoclonal antibody”).
Etymology from Wiktionary, CC BY-SA 4.0.
tocilizumab
Today it means: A human monoclonal antibody against the interleukin-6 receptor. Used to attenuate counterproductive immune responses in certain diseases (autoimmune or infectious). Full definition →