Yes, dido is a Scrabble word!
...and is worth 6 points in Scrabble, and 6 points in Words with Friends
dido
Noun
1. (Roman mythology) a princess of Tyre who was the founder and queen of Carthage; Virgil tells of her suicide when she was abandoned by Aeneas
What Scrabble words can I make with the letters in dido?
3 Letter Words
2 Letter Words