Merriam-Webster also changed the definition of "vaccine". Jan 18th, 2021: https://web.archive.org/web/20210118193104/https://www.merriam-webster.com/dictionary

Merriam-Webster also changed the definition of "vaccine". Jan 18th, 2021: https://web.archive.org/web/20210118193104/https://www.merriam-webster.com/dictionary/vaccine https://web.archive.org/web/20210118193104/https://www.merri... > a preparation of killed microorganisms, living attenuated organisms, or living fully virulent organisms that is administered to produce or artificially increase immunity to a particular disease Now: > a preparation that is administered (as by injection) to stimulate the body's immune response against a specific infectious agent or disease