The word 'vacuna' is not an English word. It is the Spanish word for 'vaccine', which refers to a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease. noun
The doctor administered the vacuna to protect the child from measles.
Many countries are working to ensure that everyone has access to the vacuna.