抗原 kàngyuán antigen Origin Definitions Defs Strokes Stroke Words Sentences Sents 抗原决定簇 kàngyuánjuédìngcù antigenic determinant the specific part of an antigen molecule to which an antibody attaches itself; epitope澳大利亚抗原 àodàlìyàkàngyuán hepatitis B surface antigen the protein on the surface of the hepatitis B virus, often used to screen for infection