The feminine noun "nascente" is the way to say "fountain" in Portuguese. This sounds like the verb "nacer" which means "to be born" in Spanish, so if you know that your can think of the "source" or "beginning" of something, like water "being born" from a source and then pushed out. Of course if you know the word "nascent" in English that will help you remember as well; and if you don't you may want to look it up.
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