Yes, hitherto is a Scrabble word!
...and is worth 14 points in Scrabble, and 12 points in Words with Friends
hitherto
Adverb
1. Used in negative statement to describe a situation that has existed up to this point or up to the present time
What Scrabble words can I make with the letters in hitherto?
7 Letter Words
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3 Letter Words
2 Letter Words