What does meltwater mean?
Meltwater is water that results from the melting of snow, ice, frost, or a glacier. It is especially important in discussions of mountain streams, polar regions, and glacial landscapes, where meltwater can feed rivers, lakes, wetlands, and agricultural land. The term may describe the water itself, as in “glacial meltwater,” or the material flowing from melting snow or ice. Its implications can be environmental and practical: increased meltwater may support rivers and reservoirs during dry periods, but it can also contribute to flooding, erosion, or instability in permafrost and ice-rich terrain. Meltwater is distinct from rainwater because its source is melting frozen precipitation or ice rather than a precipitation event itself. In scientific and geographic writing, the word is precise and descriptive, while in general usage it commonly refers to runoff from melting snow.
nounWater produced by the melting of snow, ice, or frost. The term is especially used for streams, pools, and runoff originating from glaciers or snowfields.
- Water produced by the melting of snow, ice, or frost, especially when it flows over land or collects in streams and lakes.
- Water released by the melting or shrinking of a glacier or ice sheet.
"The meltwater flowed downstream, forming a clear stream through the valley."
"Meltwater from the spring snow flooded the lower fields."
"The scientists measured the temperature and flow of the glacier's meltwater."
The plural is used when referring to distinct bodies, flows, or sources of meltwater.
"The researchers compared the chemistry of several Arctic meltwaters."
Glacial meltwater can release ancient water that has been trapped beneath ice for thousands of years.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does meltwater come from?
Meltwater was formed in English by combining melt with water. The word melt ultimately derives from the Proto-Germanic root *meltan-, associated with dissolving or softening, and is cognate with words such as molten and meltage in English and with cognate forms in other Germanic languages. The compound became established in modern English for water released by melting snow and ice.
Related word forms
How meltwater is actually used
The word is common in environmental, geographic, and scientific contexts. It usually refers to the water itself, while the process or source may be described as meltwater runoff or glacial meltwater.