甲流 Traditional form: 甲流 Pinyin (reading): jiǎliú Definitions: type A influenza abbr. for 甲型H1N1流感 refers to H1N1 influenza of 2009 Characters: 甲 - armor, shell; fingernails; 1st heavenly stem 流 - to flow, to drift, to circulate; class Traditional characters: 甲 - armor, shell; fingernails; 1st heavenly stem 流 - to flow, to drift, to circulate; class