allotropismn.

1845 J. W. Draper in Amer. Jrnl. Sci. 49 348 Having established the fact of the allotropism of chlorine, I shall then show its connexion with the theory of substitutions of M. Dumas.

1858 G. H. Lewes Sea-side Stud. 211 Chemical changes, both of decomposition and allotropism.

1881 N. Lockyer in Nature No. 617. 397 The substances in which allotropism is most marked are all metalloids which have not been found in the sun.

1925 Jrnl. Franklin Inst. 200 831 The most familiar instances of allotropism, oxygen and phosphorus, are dependent on atomic not on molecular groupings, but with graphite, diamond and carbon-blacks the differences are seemingly not regarded as due to changes in the intimate atomic structure.

1974 Jrnl. Solid State Chem. 11 234/1 The formulation of a relationship between allotropism and other physical properties would be of great help both in theory and application.

2006 S. Lohani & D. J. W. Grant in R. Hilfiker Polymorphism Pharmaceut. Industr. ii. 21 The phenomenon of polymorphism in molecular crystals is analogous to allotropism among elements.