I think, Jehu, that Frenchy was referring to external Bible authorities other than a dictionary.
Since you're in college (boy, have things changed....when I was a young JW, college was pretty much forbidden (sigh)), you can probably understand the danger inherent in researching just one author's point of view when you write a paper. In order to determine the truth of a matter, one usually researches various authors and various points of view, rather than just one.
I'm sure you'll admit that a dictionary does not really do much as far as researching ideas and theories. It has been my experience that the Society quotes from those who support what the Society is trying to present, while ignoring any who disagree. Using only the Society's publications (along with a dictionary), gives a very narrow perspective on any subject that you're investigating.