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spot test

noun
1.
an informal test run without elaborate preparation in order to obtain an immediate sample response.
2.
Chemistry. a test for the identification of an element or compound by means of a reagent that produces a characteristic color change or precipitate.
Compare spot plate.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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