Definition of test:

part of speech: noun

An oath which military and civil officers were obliged to take against Popery under the celebrated Test Act, repealed in 1828; an oath or affirmation generally.

part of speech: noun

The vessel in which a metal is tried; any critical trial or examination; anything used to distinguish substances, or to detect their presence; standard; criterion; proof.

part of speech: noun

A shell.

part of speech: verb

To bring to a trial and examination; to compare with a standard; to prove by experiment; to put to the proof; to refine, as gold or silver, by means of the test.