allotropy

1. n. The property of existing in two or more conditions which are distinct in their physical or chemical relations. Source: opted

2. n. the phenomenon of an element existing in two or more physical forms Source: wordnet

3. 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. Source: webster

4. n the phenomenon of an element existing in two or more physical forms Source: ecdict

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