Noah Webster
Testing
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.