antibody
/ˈæntɪˌbɒdi/ · an·ti·bod·y
noun
- A protein produced by B‑lymphocytes that binds to a specific antigen, marking it for neutralization or destruction. The patient's blood test showed a high level of antibodies against the flu virus.
Did you know? The first therapeutic use of antibodies, known as serum therapy, was pioneered by Emil von Behring in the 1890s, earning him the first Nobel Prize in Physiology or Medicine.