How to Use the U: UFOLOGY

Interestingly, UFOLOGY - the study of UFOs, is present in The Dictionary.

And it is even pluralized, UFOLOGIES.

How can UFOLOGY be present, but not UFO????

But UFO is not in The Dictionary.

Yes, UFO is an acronym for Unidentified Flying Object, but if you're going to have UFOLOGY as a word, then surely UFO (pronounced You-Fo) should be a word also.

But it isn't.