vestigial

1 ENTRIES FOUND:
vestigial /vɛˈstɪʤijəl/ adjective
vestigial
/vɛˈstɪʤijəl/
adjective
Britannica Dictionary definition of VESTIGIAL
1 
technical, of a body part : remaining in a form that is not fully developed or able to function
2 
formal : remaining as the last small part of something that existed before