nonsuperimposable

adjective non·su·per·im·pos·able \ ˌnän-ˌsü-pər-im-ˈpō-zə-bəl \

Definition of nonsuperimposable

: not capable of being superimposed : not superimposable
  • nonsuperimposable mirror images
; especially : chiral
  • nonsuperimposable molecules

First Known Use of nonsuperimposable

1890

in the meaning defined above

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