When he withdrew it, some silvery substance came away, stretching from temple to wand like a thick gossamer strand, which broke as he pulled the wand away from it and fell gracefully into the Pensieve, where it swirled silvery-white, neither gas nor liquid.
From it, he withdrew silvery, gossamer-fine strands of thought clinging to the wand and deposited them into the basin.
There are no more uses of "gossamer" in the book.
Show samples from other sources
a fairy with gossamer wings
...a parachute — a few gossamer yards grasping onto air and suspending below them, with invisible threads, a human life,