i·so·mer
noun/ˈaɪsəmə(r)/
/ˈaɪsəmər/
- (chemistry) one of two or more compounds that have the same atoms, but in different arrangements
异构体；同分异构体 - (physics) one of two or more nuclei that have the same atomic number, but different energy states
同核异能素；同质异能素
Word Originmid 19th cent.: from Greek isomerēs ‘sharing equally’, from isos ‘equal’ + meros ‘a share’.