btso ba

བཙོ་བ
1) [p btsos f 'tsod pa; 2) means of curing a disease; 3) dye, color, bleach, distill, refin[ing] purifi[cation] smelt[ing] [IW]

cauterization [JV]

to dye, to color; ft. of 'tshod pa [RY]