LEARNit Dictionary
the philosopher’s stone
noun
/ðə fəˌlɒsəfəz ˈstəʊn/
UK
/ðə fəˌlɑːsəfərz ˈstəʊn/
US
1
an imaginary substance that, in the past, people believed could change any metal into gold or silver, or could make people live forever
سنگ کیمیا, اکسیر اعظم