Presolar refers to something that existed before the formation of our solar system. Some synonyms for presolar include pre-sun, pre-cosmic, pre-galactic, and pre-stellar. These words all refer to things that existed before the formation of our solar system and are often used in the context of studying ancient material, such as meteorites or interstellar dust, to gain insights into the origins of our solar system and the universe as a whole. These terms are important in the scientific community as they are used to describe phenomena that existed before our current understanding of the universe, providing a glimpse into its early history.