Yes, retia is a Scrabble word!
...and is worth 5 points in Scrabble, and 5 points in Words with Friends
retia
Noun
1. A network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels
What Scrabble words can I make with the letters in retia?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words