Readily absorbing moisture, as from the atmosphere.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hygroscopic" in a sentence
"The water retained by this force is called hygroscopic water and it consists of the water held within 0.0002 millimeters of the surface of soil particles."
"The maximum limit of this water around a soil particle is known as the hygroscopic coefficient."
"This is known as hygroscopic moisture, or "water of condition"."