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uptight
uptime
uptown
uptrend
upturn
upward
upward mobility
upwardly mobile
upwelling
upwind
Ur
ur- (1)
ur- (2)
uracil
uraemia
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upwelling

up·well·ing [ up wélling ] (plural up·well·ings)


noun 
Definition:
 
1. act of rising to surface: an act of rising up from inside the Earth or the body

2. surge: a steady surge of something such as an emotion

3. rising of water to surface: a process in which cold nutrient-rich water rises to the surface from the ocean depths

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