Definition of allotropy noun from the Oxford Advanced Learner's Dictionary

 

allotropy

 noun
noun
BrE BrE//əˈlɒtrəpi//
 
; NAmE NAmE//əˈlɑːtrəpi//
 
[uncountable](chemistry)
 
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the existence of two or more allotropes of a chemical element Word Origin mid 19th cent.: from Greek allotropos ‘of another form’, from allo- ‘other’ + tropos ‘manner’ (from trepein ‘to turn’).
See the Oxford Advanced American Dictionary entry: allotropy