Antisera is a term used in the medical world to describe a serum that contains antibodies which are specific to a particular antigen. These antibodies are used to neutralize toxins and other harmful substances that enter the body. Synonyms for antisera vary depending on the context in which they are used. Some alternative names for antisera include immune serum, antitoxin, and serum antibodies. Antisera may also be referred to as immunoglobulins or simply antibodies. The term antibodies is more commonly used when referring to natural antibodies produced by the body's immune system. Nevertheless, all these synonyms refer to substances that can help protect the body from harmful infections and other medical conditions.