Have you ever been in a meeting when someone just does not stop talking?
When you start a meeting, let the group know you want everyone to speak. Tell the incessant talker to let others join the conversation and make sure you go back to those who get interrupted.
Most of all, if you get interrupted say that you were not finished and you want to hear from others with their thougths on your points.
All sound obvious? Maybe, but if you do not lead the meeting this way you may as well close it out.