血凝素 Traditional form: 血凝素 Pinyin (reading): xuèníngsù Definitions: hemaglutinin (the H of virus such as bird flu H5N1) Characters: 血 - blood 凝 - to coagulate, to congeal; to freeze 素 - plain; white; vegetarian; formerly; normally Traditional characters: 血 - blood 凝 - to coagulate, to congeal; to freeze 素 - plain; white; vegetarian; formerly; normally