An Etymological Dictionary of Astronomy and Astrophysics

Material, in solid, liquid, or gaseous form, thrown out by a body, especially as a result of → volcanic eruption, → meteoritic impact, or → supernova explosion. See also: → ejecta blanket, → supernova ejecta.

Etymology (EN): Plural of L. ejectus, → eject.

Etymology (PE): Ešânâk “that which is ejected,” from šân present
stem of šândan→ eject + suffix -âk.