But the Kindle can read a book if need be as noted at http://www.dummies.com/how-to/content/let-your-kindle-read-to-you-with-texttospeech.html
And since it has a web browser why would we need in book definitions when we can head to the web to get more information and definitions?
-> Get your children out of the 19th and prior century by showing them how to find the definitions.
PS. Yes there are some books that are actually applications that do what you want but you can imagine due to copy right and patent law you have not seen what you asked for.
I am looking for software which assists kids when they are reading. is there any reader or software which will read out loud individual words they get stuck on, and define them maybe as well?