> as lemmas
non-superimposable
non-superimposable adj. 
/ˌnɒnsjuːp(ə)rᵻmˈpəʊzəbl/,
Brit. /ˌnɒnsuːp(ə)rᵻmˈpəʊzəbl/
, /ˌnɒnsuːp(ə)rᵻmˈpəʊzəbl//ˌnɒnsjuːp(ə)rᵻmˈpəʊzəbl/U.S. /ˌnɑnˌsup(ə)rᵻmˈpoʊzəb(ə)l/
/ˌnɑnˌsup(ə)rᵻmˈpoʊzəb(ə)l/ΚΠ
1890 Chemist & Druggist 37 620/1 We should then get, as in the models shown, two non-superimposable figures, one of which would be the reflected image of the other.
1974 D. Nicholls Inorg. Complexes v. 47 (heading) It must have no plane of symmetry and the structure and its mirror image must be different, that is non-superimposable.
2007 B. Nicholson Chem. of Love vii. 192 The chemical representation for a pair of enantiomers shows two non-superimposable mirror images.
<
as lemmas