C2 adjective /vɛˈstɪdʒiəl/
vestigial
vestigial
Meaning
Relating to a small, undeveloped remnant of something that was once much larger or more functional.
Example
Humans have a vestigial tailbone that no longer serves its original purpose.
Los humanos tienen un hueso en la cola vestigial que ya no cumple su propósito original.