Jayaraych's blog: "the blog of the log"

Spelling dilemma: It seems there were a lot of people, including me, that were taught in school to spell it as "dilemna". I distinctly remember it being on a list of "tricky words that are not spelled as they sound". What I was taught is of course etymologically incorrect. Was this the ultimate practical joke of a text book writer in the 50's to create a self-defining word?