means Describing a being or thing that lives forever and cannot die, or a fame that never fades.

from From Latin immortalis, built from the negating prefix in- ("not") plus mortalis ("subject to death"), itself from mors, mortem ("death"). That same mor- root for death runs through mortal, mortuary, and murder, and traces back to a Proto-Indo-European root *mer- meaning "to die." English borrowed it in the late Middle Ages, often through French, when poets and theologians needed a word for souls and gods that the grave couldn't touch.