- viss
- , vis, visea traditional unit of mass or weight in southern India and southeast Asia, equal to 100 ticals. The name is derived from the Tamil visai. The traditional size of the viss is about 1640 grams (about 3.62 pounds), but it is currently used in the Southeast Asian drug trade as a metric unit equal to exactly 1600 grams (1.6 kilograms or 3.527 pounds). This metric unit is called the choi or joi in Laos and Thailand.
Dictionary of units of measurement. 2015.