Unlike other dictionaries you might have on your device, TapTap Word lets you look up the definition of words in the application you are running, without leaving the application! No ads.
Ragamuffin Software is the creator of the tool which can be found in the Books & Reference category. According to the latest information, this application is rated 5 on Google Play. Get the latest .apk file of TapTap Word 1.1 free of charge and have a look at users' reviews on Droid Informer. You will need 46 KB of free disk space to set up the app that is designed for Android 2.3.3 and above.
According to the antivirus report, the app doesn't contain viruses or any kind of malware.