washing -
The residue after an ore, etc, has been washed.
washing -
The liquid used to wash an ore.
Verb
washing -
Present participle of wash.
Wikipedia
Washing is one way of cleaning, namely with water and often some kind of soap or detergent. Washing is an essential part of good hygiene and health. Often people use soaps and detergents assist in the emulsification of oils and dirt particles so they can be washed away.
OmegaWiki Dictionary
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washing The work of cleansing, usually with water and soap.