Yes, reflux is a Scrabble word!
...and is worth 16 points in Scrabble, and 18 points in Words with Friends
reflux
Noun
1. An abnormal backward flow of body fluids
2. The outward flow of the tide
What Scrabble words can I make with the letters in reflux?
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Words that can be created with an extra letter added to reflux:
E:flexure