Something that bubbles or produces bubbles; especially a water fountain where you push a button to drink, or a person who bubbles.
From 'bubble' plus '-er', a suffix that creates agent nouns (one who does the action, or a thing that does it).
In different American regions, 'bubbler' means different things—it's a drinking fountain in Wisconsin and Massachusetts, but that same device is a 'water fountain' elsewhere!
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