the GNU version of the Collaborative International Dictionary of English
n. The act of deliquescing or liquefying; process by which anything deliquesces; tendency to melt.
The Century Dictionary and Cyclopedia
n. Liquefaction by absorption of moisture from the atmosphere (a property of certain salts and other bodies); a melting away or dissolving.
Word Usage
"Researchers found the most common types of vitamin C used in vitamin supplements and other fortified products are prone to a process called deliquescence, in which humidity causes a water-soluble substance to dissolve."