hy·gro·scop·ic

[hahy-gruh-skop-ik]
adjective
absorbing or attracting moisture from the air.

Origin:
1765–75; hygroscope + -ic

hy·gro·scop·i·cal·ly, adverb
hy·gro·sco·pic·i·ty [hahy-gruh-skoh-pis-i-tee] , noun
non·hy·gro·scop·ic, adjective
non·hy·gro·scop·i·cal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hygroscopic (ˌhaɪɡrəˈskɒpɪk) [Click for IPA pronunciation guide]
 
adj
(of a substance) tending to absorb water from the air
 
hygro'scopically
 
adv
 
hygrosco'picity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Hygroscopic is always a great word to know.
So is callithumpian. Does it mean:
a scrap or morsel of food left at a meal.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
American Heritage
Medical Dictionary

hygroscopic hy·gro·scop·ic (hī'grə-skŏp'ĭk)
adj.
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
Some metals form hygroscopic salts with nitric acid that cannot be easily dried
  prior to their being cooled and counted.
These crystals are typically hygroscopic requiring air-tight housing for
  handling and their fabrication is costly.
The other main disadvantages are that it evaporates and is hygroscopic.
The best plasticizers for zein are hygroscopic in nature.
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