The story
From [Term?] + -tu- (“tumor”) + -ximab (“chimeric monoclonal antibody”).
Etymology from Wiktionary, CC BY-SA 4.0.
rituximab
Today it means: A chimeric monoclonal antibody (trademark Rituxan) administered by intravenous injection especially to treat non-Hodgkin lymphoma and chronic lymphocytic leukemia by binding to the protein CD20 found on the surface of B cells and causing their lysis. Full definition →