noun
the quality or property of absorbing moisture from the air
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The hygroscopicity of the material makes it ideal for use in humidity control systems.
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This material is super hygroscopic, so it's great for keeping things dry.
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Dude, this stuff sucks up moisture like a sponge - it's so hygroscopic!
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Her personality had a hygroscopicity about it, always absorbing the emotions of those around her.