流感 Traditional form: 流感 Pinyin (reading): liúgǎn Definitions: flu; influenza Characters: 流 - to flow, to drift, to circulate; class 感 - to affect, to move, to touch; to perceive, to sense Traditional characters: 流 - to flow, to drift, to circulate; class 感 - to affect, to move, to touch; to perceive, to sense