Typhon: eBook reader with Rikai dictionary lookup for Android

Thanks!

I have looked into EPWING as a began this project but it seemed like a headache because not only the format is poorly documented but it is also mainly abandoned for what I saw.  

But I will have another look for sure. 

For Wordnet, I did not know it, but that seem pretty doable! Is this the last version? I saw there is a link saying that they maintain on this other website but it does not work for me.