'Waist' in the Bible

There was the likeness of the appearance of a human being seated on the likeness of the throne high above. I noticed that from what appeared to look like his waist upward there was something that looked like metal that glowed as if it were immersed in fire. Below this there was something resembling fire, with a radiant light surrounding him.

and I saw a likeness comparable to the appearance of a man. From his thighs downward there was the appearance of fire, and from his waist upward, there was the appearance of brightness that looked like brass.