A recent question on rose forms and shapes came up within PlantFiles. I checked Gardenology, and discovered we were really "light" on rose terms. So I've added some of the classes, forms and shapes I was familiar with, and gave them their own section here: http://davesgarden.com/guides/terms/cat.php?catid=3
But there are probably many other rose-specific terms that those in-the-know could help with.
And within these existing entries, anyone can add more definitions, send us corrections, and/or add pictures as illutrations.