I was wondering how could I remove one (wrongly inserted) entry/word from the ispell private-dictionary.
EDIT
after more digging i am still unab
Super late to the party but hopefully I can help someone else with this issue. If you look at the top of the emacs window it tells you what program emacs is using for the dictionary. In my case it read "prog: hunspell."
So all you have to do in that case is find the hunspell dictionary and edit (i.e., remove) the rogue word.
In my case, 'emacs ~/.hunspell_en_US', opened a text file where I located and removed the word I accidentally added.