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Answer for the clue "The phenomenon of an element existing in two or more physical forms ", 9 letters:
allotropy

Word definitions for allotropy in dictionaries

Wikipedia Word definitions in Wikipedia
Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state , known as allotropes of these elements. Allotropes are different structural modifications of an element; the atoms of ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Allotropism \Al*lot"ro*pism\, Allotropy \Al*lot"ro*py\, n. [Gr. ? other + direction, way, ? to turn: cf. F. allotropie.] (Chem.) The property of existing in two or more conditions which are distinct in their physical or chemical relations. Note: Thus, carbon ...

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) A property, exhibited by some elements of existing in multiple forms with different atomic structures.

WordNet Word definitions in WordNet
n. the phenomenon of an element existing in two or more physical forms [syn: allotropism ]