al·lot·ro·py
noun/əˈlɒtrəpi/
/əˈlɑːtrəpi/
[uncountable] (chemistry)- the existence of two or more allotropes of a chemical element
同素异形体：化学元素存在两个或多个同素异形体 Word Originmid 19th cent.: from Greek allotropos ‘of another form’, from allo- ‘other’ + tropos ‘manner’ (from trepein ‘to turn’).