Wei Collection, Lower Volume
Radical: Meat (ròu)
Kangxi Strokes: 15
Page 987, Entry 27
Broad Rimes (Guangyun): Pronounced wo.
Collected Rimes (Jiyun), Dictionary of Rimes (Yunhui): Pronounced wo.
Broad Rimes (Guangyun): Thick fat.
Dictionary of Rimes (Yunhui): Abundance of fat.
Rites of Zhou (Zhouli), Winter Official, Record of Trades (Kaogongji), Tanners (Baoren): If one desires leather to be white, wash it repeatedly to make it firm. If one desires it to be soft and smooth, smear it with fat to make it supple.
Commentary: The term wo is read like the wo in the phrase zhan-wo. It refers to applying thick fat to leather to make it soft and pliable.
Also, Collected Rimes (Jiyun): Pronounced wu. Same meaning.
Rites of Zhou (Zhouli), Winter Official, Record of Trades (Kaogongji), Tanners (Baoren), Explanation of Text for Smearing Fat: Pronounced wo. Liu pronounces it wu.