What does deliquesce mean?
To deliquesce is to dissolve or melt away, most precisely in the sense used by chemists: when a highly soluble solid, such as calcium chloride, absorbs moisture directly from the surrounding air until it turns into a liquid solution. This process, called deliquescence, occurs because such compounds are so strongly attracted to water that they pull humidity out of the atmosphere itself. Beyond the laboratory, the verb also carries a figurative meaning — to fade, soften, or vanish as though dissolving — as when a shapeless fog deliquesces into the morning sky. The word comes from the Latin deliquescere, meaning to melt away or dissolve. It belongs to formal and technical registers rather than everyday speech, lending precision to scientific description and a certain elegance to literary metaphor alike. Writers reach for it when ordinary words like melt or dissolve feel too plain for the slow, almost magical disappearance of one state into another.
verbTo melt away or disappear as if by dissolving; in chemistry, of a solid, to absorb moisture from the air and gradually dissolve into a liquid solution.
- Of a solid substance, especially a soluble salt: to absorb moisture from the air until it dissolves into a liquid.
- (Figurative) To melt away, vanish, or lose form or distinctness, as if dissolving.
"In the summer heat, the snowman slowly deliquesced into a puddle on the lawn."
"Calcium chloride is so hygroscopic that it will deliquesce if left exposed to humid air."
"By late morning the morning mist had deliquesced into nothing, leaving a clear blue sky."
Deliquesce is what happens when chemistry gets poetic — a salt left open to humid air doesn't just get damp, it literally drinks moisture from the atmosphere until it vanishes into its own solution.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deliquesce
Deliquesce derives from the Latin verb deliquescere, formed from de- ('away, down') plus liquescere ('to become liquid'), itself rooted in liquere ('to be fluid'). It entered English in the late 18th century, primarily through scientific writing describing salts that dissolve by absorbing airborne moisture. It shares its liquid root with words such as liquid and liquefy.
Related word forms
How deliquesce is actually used
Formal or technical in register. The chemical sense (a solid absorbing atmospheric moisture and dissolving) dominates scientific writing; figurative uses appear mostly in literary prose. Often used with 'into' to specify what the thing melts into.
Easily confused with deliquesce
Desiccate means to dry out completely, the opposite process of deliquescing, which involves absorbing moisture until something dissolves.
Delinquent refers to someone failing a duty or breaking the law; it shares only a Latin root with deliquesce and has nothing to do with melting or dissolving.