What is the word I'm looking for?

I read this expression or a word a while ago on wikipedia, describing a person who pays so much attention to detail (with reference to academics, most likely), to the point that it's irritating to his colleagues. The word either describes a person who does that, or the tendency do that.

I read the definition, and thought it perfectly describes a group mate of mine. I think it might've been a latin word.

Any ideas what that word is? Thanks.