Antibody/ˈæntibɑːdi/ Definition 1 of 1Pro Tip 1/3Medical Jargon Used in healthcare and science, may confuse if used in casual conversation. The doctor explained the antibody levels in my blood. Pro Tip 2/3Metaphorical Use Sometimes used metaphorically to describe a defense against problems. Good study habits are an antibody against failing grades. Pro Tip 3/3Context Clarity Clarify whether you're talking about a medical test, treatment, or health condition. The antibody test confirmed her immunity to the virus.