Currently xfce4-dict provides a c-menu with all editing elements disabled: cut, paste, etc. The minor issue with this arrangement is that the c-menu can be unnecessarily long. Here I always use the dict on the bottom of my screen, so the c-menu often pops up on top of the mouse pointer. 

Alternatively the useless cut, paste, delete, input* elements could be removed altogether from the read-only pane and leave only find, copy and select all. Design-wise I'm not sure that this is a very good idea. What do you think?