n.1. Charm or attractiveness that stems from celebrity and tends to forestall criticism: "The relative unknowns ... bring enough style [to the musical] to make up for any perceived lack of stardust" (Charles Isherwood).
2. A dreamlike, romantic, or uncritical sense of well-being.
3. a. Dust formed in very hot gasses ejected from stellar atmospheres or in supernova explosions.
b. A cluster of stars too distant to be seen individually, resembling a dimly luminous cloud of dust. Not in scientific use.
c. Minute particles of matter that fall to Earth from the stars. Not in scientific use.