noun
a substance or solution that has been retained during a filtration process
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The retentate from the filtration process contained a high concentration of the desired compound.
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I accidentally spilled some retentate on the lab bench, can you help me clean it up?
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I have no idea what to do with this retentate, it's just sitting in the corner of the lab.
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The retentate of memories from that trip still lingered in her mind, vivid and clear.