Yes, arcus is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
arcus
Noun
1. A whitish deposit in the shape of an arc that is sometimes seen in the cornea
What Scrabble words can I make with the letters in arcus?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words