一切經音義 5.206

5.206

Float bladder (浮囊: the first character has the fanqie 附無反; Kong [Anguo's] commentary on the Shangshu states: "Drifting upon the flow is called fu (浮)." Fu means floating (fanqie 芳劒反). Jia Kui's commentary on the Guoyu states: "Fu means light." The second character has the fanqie 奴即反; the Shuowen jiezi states: "Nang (囊) means a sack (橐, sound 託)." Note: it refers to a leather bag filled with air; one relies on the floating bladder to cross great waters. It is an air-skin. The sūtra takes its lightness and buoyancy as a metaphor).