D defs.my
Entry 2 senses Webster, 1913

Testing

/tĕs'-tĭng/ · Test·ing · IPA /ˈtɛs.tɪŋ/
01 n. The act of testing or proving; trial; proof.
  1. 1.
    The act of testing or proving; trial; proof.
  2. 2.
    The operation of refining gold or silver in a test, or cupel; cupellation.(Metal.)
Phrases & compounds
Testing machine — a machine used in the determination of the strength of materials, as iron, stone, etc., and their behavior under strains of various kinds, as elongation, bending, crushing, etc.