房颤 fángchàn atrial fibrillation Origin Definitions Defs Strokes Stroke Words Sentences Sents 房 fáng abbreviation of 心房 xīnfáng atrium the two upper chambers of the heart that receive blood from the veins; the cardiac atrium颤 顫 chàn verb abbreviation of 颤动 顫動 chàndòng to vibrate to vibrate, quiver, or shake rapidly and continuously