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vestigial
atomic energy

ves·tig·i·al

vestigial

 
pronunciation:
ve stI jl [or] ve stI ji l
part of speech: adjective
definition: of, pertaining to, or being a vestige, esp. an anatomical one.
The appendix is a vestigial structure in the human body.
similar words:
rudimentary
derivation: vestigially (adv.)