Vaccinum is a Latin word that means vaccine. Synonyms for this term include immunization, inoculation, prophylactic, shot, serum, and vaccine. Immunization refers to the administration of a vaccine to prevent the spread of a disease. Inoculation is a process of injecting a vaccine into the body to create immunity to a particular disease. Prophylactic refers to the use of vaccines to prevent or lessen the severity of disease. A shot or injection is a method of delivering a vaccine into the body. Serum is a substance containing antibodies that can be used to prevent or treat a disease. And vaccine is a suspension of weakened or dead pathogens that allows the body to build immunity to a disease-causing agent.