vestigially

noun

1. a trace, mark, or sign of something that once existed but has passed away or disappeared: vestiges of the ancient wall
2. a trace; bit: not a vestige of hope left
3. Biol. a degenerate, atrophied, or rudimentary organ or part, more fully developed or functional in an earlier stage of development of the individual or species
   also vestigium

Origin: Fr < L vestigium, footprint