hygroscopicity

https://doi.org/10.1351/goldbook.15197
Tendency of a substance to absorb water from the atmosphere.
Note: A substance that absorbs moisture from the atmosphere is called hygroscopic.
Source:
PAC, 2009, 81, 971. (Glossary of terms related to pharmaceutics (IUPAC Recommendations 2009)) on page 988 [Terms] [Paper]