Can someone tell me where there is a physical description of the wings?
You can't because there never is one. Let's see the pro-wing people claim that "and its wings were spread from wall to wall" as proof that they are physical wings, but is not!
"and its wings were spread from wall to wall" ok so where is the description of the wings? Right before. "the shadow about it reached out like two vast wings"
So the decription of the wings is the shadow that surronds the
Balrog.
What is shadow?
Tolkien's shadow isn't your normal shadow cast when light is being blocked, the
Balrogs shadow isn't just a lack of light, but a region of darkness that they carry around with them. So the shadow is something the Balrog can control just as
Sauron controls the "wings of shadow" released by Mount Doom.
I have heard people say that if Tolkien had meant shadow like wings then he would have wrote " and the shadow like wings were spread from wall to wall". Why? He has already described the wings "the shadow about it reached out like two vast wings". How do you see that the shadow becomes physical wings within the passage. Tolkien was a presicon writer and if he had meant phsyical wings he would have wrote in in the description of the Balrog.
"What it was could not be seen: it was like a great shadow, in the middle of which was a dark form, of man-shape, maybe, yet greater; and a power and terror seemed to be in it and to go before it."
Where is there any mention of phsyical wings?
People also say that Balrogs can fly because of a few quotes, "flying from
Thangorodrim", and "and they passed with winged speed over Hithlum". Well if the first is to be taken literaly then so does this passage, "
Gandalf came flying down the steps and fell to the ground in the midst of the Company". So if the Balrog can fly then so can Gandalf! Winged speed is used by many writes to discribe fast
travel, but usually not to
creatures that have wings, you wouldn't describe a bird flying at winged speed, of course it's moving at winged speed.
Any pro wing argument you have I can find a way to counter it, but in truth the question can never be answered.