noun
a small, straight-sided vessel used in laboratory experiments or in spectrophotometry
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The scientist placed the sample in the cuvette before inserting it into the spectrophotometer.
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Make sure you put the liquid in the little glass thingy before you start the test.
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Don't forget to pour the stuff in the cuvette before you do the experiment.
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Her mind was like a cuvette, containing different thoughts and ideas waiting to be analyzed.