What does deliquesced mean?
Deliquesced is the past tense and past participle of the verb deliquesce, meaning to have melted or dissolved into liquid, most specifically by absorbing moisture from the surrounding air. The term belongs chiefly to chemistry: hygroscopic substances such as calcium chloride, potassium hydroxide, and ferric chloride are said to have deliquesced when they draw water vapor from the atmosphere until they dissolve into their own absorbed moisture, forming a concentrated solution. The word can also be used figuratively to describe anything that seems to soften, sag, or melt away gradually, as snow or a wax figure might. It carries a formal, technical tone and appears mainly in scientific literature rather than casual conversation. Its Latin root, liquescere ('to become liquid'), connects it to words like liquid and liquefy, but deliquesced retains a precise, specialized sense that makes it valuable for describing exactly how certain solids surrender to dampness.
verb (past tense and past participle)Past tense of deliquesce: to have melted away or dissolved into liquid, especially by absorbing moisture from the air.
- To have melted or dissolved into a liquid by absorbing moisture from the atmosphere, as certain hygroscopic substances do.
- (Figurative) To have softened or seemed to melt away gradually.
"The calcium chloride crystals deliquesced overnight, leaving a puddle in the jar."
"The anhydrous ferric chloride had deliquesced into a dark syrup before anyone opened the bottle."
"In the afternoon heat the snowman had all but deliquesced into the lawn."
Some salts don't just melt when heated — they pull water straight out of the air until they vanish into a puddle: that's deliquescing.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deliquesced
Deliquesced derives from Latin liquescere, meaning 'to become liquid', formed from liquis-, stem of liquere ('to be fluid'), with the intensive prefix de-. The verb entered English in the late eighteenth century as a technical term in chemistry for solids that absorb atmospheric moisture and dissolve. It shares its Latin root with liquid, liquefy, and liquor.
Related word forms
How deliquesced is actually used
Formal and technical register, found chiefly in chemistry and scientific writing; rare in everyday speech. The base verb 'deliquesce' is more common than this inflected form.
Easily confused with deliquesced
Liquefied means turned to any liquid form generally, while deliquesced specifically means dissolved by absorbing moisture from the air.