One thing you quickly learn when performing even a cursory review of Dinosaurs in general is that they are possessed of a great variety of long, complicated sounding names. Now, obviously we need to call them SOMETHING, and using latin or pseudo-latin sounding terms allows us to apply some measure of appropriate description so that everybody knows what we're talking about. Even if we're not always sure exactly how to pronounce it.
Of course, one of the other functions of such nomenclature is that it all sounds very clever and official. Which is just as well really. Because if we were to actually set the TARDIS telepathic circuits to translate right down to the root meanings of terms and try to have a conversation about Dinosaurs we would sound, in all honesty, utterly retarded, if only for the number of times you end up saying lizard in a single sentence.
So that's what I'm going to do. Enjoy.