Presolar grains are dust grains dating from before the birth of the Sun. The term is used for grains found within meteorites with isotope abundances that suggest other than a solar system origin. The grains are presumed to result from the stellar wind of other stars long ago, and from other processes that create dust; thus they provide information relevant to stellar structure and stellar evolution models. The dust grains of the IPM are cleared out in relatively short time, leaving meteoroids/meteorites as our best provider of presolar grains.
The term stardust is similar, but in its precise use, specifically refers to dust from stars, e.g., the product of stellar wind.