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Yes, sinus is a Scrabble word!
...and is worth 5 points in Scrabble, and 7 points in Words with Friends
1. An abnormal passage leading from a suppurating cavity to the body surface
2. Any of various air-filled cavities especially in the bones of the skull
3. A wide channel containing blood; does not have the coating of an ordinary blood vessel
What Scrabble words can I make with the letters in sinus?
5 Letter Words
4 Letter Words
3 Letter Words
2 Letter Words