1
: a test for determining the flash point of a volatile oil by use of a closed cup in which the oil is heated over a fixed flame and by use of a small movable flame that passes at regular intervals of temperature over the surface of the oil
2
: a test for the stability of smokeless powder and similar explosives in which a ground sample is heated in a test tube with potassium iodide-starch paper, the time required for discoloring the paper being the measure of the stability
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Merriam-Webster unabridged
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