Bad: Opatory
Good: Operatory

I really need to learn how to spell this word correctly. Upon seeing the correct spelling I realize that much of my misunderstanding of the word is that a lot of people will shorten the word.

If I can remember that OPERATory is where dentist OPERATe on teeth then maybe I’ll remember it better.

If you have a better idea of the spelling, please feel free to share.