test specimenn. a piece of metal, etc. prepared for a mechanical test.
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the world > action or operation > endeavour > trial or experiment > trial, test, or testing > [noun] > specific tests or testing > test of materials or equipment > piece prepared for
test-piece1876
test specimen1894
1894 W. J. LinehamText-bk. Mech. Engin. 378 Shackles for Test Specimens should be carefully designed.