/up wel"ing/ , n.
1. an act or instance of welling up: an upwelling of public support; an upwelling of emotion in his voice.
2. Oceanog. the process by which warm, less-dense surface water is drawn away from along a shore by offshore currents and replaced by cold, denser water brought up from the subsurface.
[ 1850-55; UPWELL + -ING 1 ]