allotropy
noun/əˈlɒtrəpi/
/əˈlɑːtrəpi/
[uncountable] (chemistry)- the existence of two or more allotropes of a chemical elementWord Originmid 19th cent.: from Greek allotropos ‘of another form’, from allo- ‘other’ + tropos ‘manner’ (from trepein ‘to turn’).
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allotropy