absorbing or attracting moisture from the air.

1765–75; hygroscope + -ic

hygroscopically, adverb
hygroscopicity [hahy-gruh-skoh-pis-i-tee] , noun
nonhygroscopic, adjective
nonhygroscopically, adverb
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World English Dictionary
hygroscopic (ˌhaɪɡrəˈskɒpɪk)
(of a substance) tending to absorb water from the air

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hygroscopic hy·gro·scop·ic (hī'grə-skŏp'ĭk)
Readily absorbing moisture, as from the atmosphere.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hygroscopic   (hī'grə-skŏp'ĭk)  Pronunciation Key 
Relating to a compound that easily absorbs moisture from the atmosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The other main disadvantages are that it evaporates and is hygroscopic.
Remember, the reason that ethanol can't be sent via pipeline is because it's
  too hygroscopic and would take on too much water.
It was a hygroscopic gel, broken up into little pieces and provided as a dry
These crystals are typically hygroscopic requiring air-tight housing for
  handling and their fabrication is costly.
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