The (ultimate) material of which the universe is composed.(noun)
The Century Dictionary (Public Domain)
Use "world-stuff" in a sentence
"The footprints of absence, formed by the subject's anxious self-circling (literally "wondering what you are"), ignore the substance around which the circles are made, the very world-stuff of which Dasein is only the ized reflection."
"Yet since continuity prevails throughout, the atoms which constitute the world-stuff must be supposed to have"
"The seeds, the germs of life that were expressed in such ways in the beginnings of life on this world, still exist in a greatly modified degree and the misunderstood phases of nature's ministry are the results of the out-working of these primitive elements still inhering in the world-stuff of which human bodies are made."