TEST'ING, participle present tense [from test.] Trying for proof; proving by a standard or by experiment. A plan for testing alkalies-- TEST'ING, noun The act of trying for proof. 1. In metallurgy, the operation of refining large quantities of gold or silver by means of lead, in the vessel called a test. In this process, the extraneous matter is vitrified, scarified or destroyed, and the metal left pure. This operation is performed in the manner of cupellation.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI