D defs.my
Entry 1 sense Webster, 1913

Allotropism

· Al·lot·ro·pism · IPA /æloʊˈtroʊpɪzəm/
01 n. The property of existing in two or more conditions which are distinct in their physical or chemical relations.
  1. 1.
    The property of existing in two or more conditions which are distinct in their physical or chemical relations.(Chem.)