You don't say what you're reading on, but if you are reading on an android device (which presumably is why you posted in this forum) there are a number of apps in the Google store that might help e.g:
https://play.google.com/store/apps/d...nary.vmrvictor
https://play.google.com/store/apps/d...ndroid.wordlog
https://play.google.com/store/apps/d...m.usr.dict.mgr