澳抗 àokàng hepatitis B antigen Origin Definitions Defs Strokes Stroke Words Sentences Sents 澳 ào proper noun abbreviation of 澳大利亚 澳大利亞 àodàlìyà Australia Australia; a country and continent in the Southern Hemisphere抗 kàng abbreviation of 抗原 kàngyuán antigen a substance that triggers an immune response in the body and reacts with antibodies; examples include certain proteins and microorganisms