Si Collection, Upper Volume
Radical: Water (shuǐ)
Entry: Pìn
Kangxi Stroke Count: 7
Page 605, Entry 10
Compendium of Characters (Zihui): Pronounced pài. The meaning is to separate the skin of hemp plants.
Also, in Collection of Characters and Rhymes (Pianyun): Pronounced chí. The meaning is the same.