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Definition 2024

welling

welling ‎(plural wellings)

The act of something that wells, or issues forth like water.
- 1947, T. A. Jaggar, Origin and Development of Craters
  Later experience suggested that such wellings up of molten glass from caverns filled with active lava in a period of outflow might be due to sudden generation of steam from cascades of water during torrential rainfall.