noun

• (astronomy)
• Small fragments of dust-like material found in space; specifically, a type of cosmic dust that formed from cooling gases ejected from presolar stars, which was then incorporated into the cloud from which the Solar System condensed.
• (informal, dated) A distant cluster of stars resembling a cloud of dust, especially if the individual stars of which cannot be resolved with a telescope.
• (archaic) Small fragments in the Earth's atmosphere or on its surface originating from meteorites; meteor dust.
• (figuratively)
• Something imaginary or lacking substance.
• An imaginary magic dust or powder that, when in one's eyes, supposedly causes one to view a person or thing favourably, even though this might not actually be warranted.
• An imaginary magic dust or powder supposedly able to give one charisma or other positive qualities; hence, charisma or glamour, especially that possessed by a celebrity.