Search the dictionary A Chinese word or character, or English Search 2 entries. sānfú 三伏 the three annual periods of hot weather, namely 初伏[chu1 fu2], 中伏[zhong1 fu2] and 末伏[mo4 fu2], which run consecutively over a period from mid-July to late August sānfúhuàpéng 三氟化硼 boron trifluoride