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 allotropism
 同素;同素異形

 Al·lot·ro·pism Al·lot·ro·py n.  Chem. The property of existing in two or more conditions which are distinct in their physical or chemical relations.
 Note: ☞ Thus, carbon occurs crystallized in octahedrons and other related forms, in a state of extreme hardness, in the diamond; it occurs in hexagonal forms, and of little hardness, in black lead; and again occurs in a third form, with entire softness, in lampblack and charcoal. In some cases, one of these is peculiarly an active state, and the other a passive one. Thus, ozone is an active state of oxygen, and is distinct from ordinary oxygen, which is the element in its passive state.
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 allotropism
      n : the phenomenon of an element existing in two or more
          physical forms [syn: allotropy]