noun Download 🔗Share A substance given to stimulate the body's production of antibodies and provide immunity against a disease without causing the disease itself in the treatment, prepared from the agent that causes the disease (or a related, also effective, but safer disease), or a synthetic substitute. Examples : "My son received the measles vaccine to protect him from getting the illness. " medicine disease biology biochemistry substance physiology virus aid science Chat with AIVocabulary GamePractice Reading