a drinking fountain that spouts water.
Chemistry. any device for bubbling gas through a liquid.

1710–20; bubble + -er1

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World English Dictionary
bubbler (ˈbʌblə)
1.  a drinking fountain in which the water is forced in a stream from a small vertical nozzle
2.  chem any device for bubbling gas through a liquid

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Then aerate what is left with an aquarium bubbler to drive off the last traces
  of moisture.
Or use a bubbler attachment on the hose, moving it as needed.
Cross section of a bubbler screen built from a corrugated pipe with a poured
  concrete base.
After sampling, tap bubbler stem gently against inside wall of bubbler bottle
  to recover as much sampling solution as possible.
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