He only hoped they would continue to work: He imagined Voldemort, a hundred yards above them as they spoke, looking for a way to penetrate what Harry visualized as a great transparent bubble.
Her eyes were thick with cataracts and sunken into folds of transparent skin, and her whole face was dotted with broken veins and liver spots.
There was a long moment of astonishment, broken by Fleur turning to Lupin and saying, in a wildly transparent attempt to break the tension.
She could not blush, but her transparent cheeks became more opaque, and her voice was heated as she replied, "Of course I — how dare you suggest -?"
Then a number of huge bangs shook the castle, and a great cavalcade of transparent figures galloped past on horses, their heads screaming with bloodlust under their arms.
Harry looked in the direction of Nick’s transparent, pointing finger and saw a tall ghost who caught sight of Harry looking at her, raised her eyebrows, and drifted away through a solid wall.
"Prestego!" she cried, and an invisible shield expanded between her and Harry on the one side and Ron on the other; all of them were forced backward a few steps by the strength of the spell, and Harry and Ron glared from either side of the transparent barrier as though they were seeing each other clearly for the first time.
"It is the only way, Nagini," he whispered, and he looked around, and there was the great thick snake, now suspended in midair, twisting gracefully within the enchanted, protected space he had made for her, a starry, transparent sphere somewhere between a glittering cage and a tank.
There are no more uses of "transparent" in the book.