Dictionary application for ipod touch
Are you inquiring about a jailbreak application?
The main construct of Apple is iOS does not sustain this capability.
The most effective you can do is duplicate and also paste words and afterwards look Google for the definition. Or paste words right into a dictionary application.
As stated by Alex, that is not a sustained attribute by iphone Apple, and also I do not assume there is any kind of Cidya application that will certainly add this capability.
My favorite dictionary App is Dictionary.com:
There is a free variation with advertisements, and also an advertisement - free variation for $2.99.