antibodya protective protein produced by the immune system in reaction to a foreign substanceEach antibody is highly specific and binds to a particular antigen on the surface of an invader.NoteEach antibody is highly specific and binds to a particular antigen on the surface of an invader.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now