[pol-ee-im-ahyd, -id]
any of a class of polymers with an imido group: resistant to high temperatures, wear, radiation, and many chemicals.

1940–45; poly- + -imide

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Further, the temperature sensor was mounted onto the polyimide substrate as well to place it in contact with the reagent tubing.
The polyimide filters include all the flux in the beryllium filters, but add cooler, longer wavelengths.
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