Chemistry term for compounds with the same molecular formula but different structural arrangements.
Glucose and fructose are isomers of each other.
nuclear isomer
enantiomer; optical isomer
rotational isomer
stereoisomer
conformational isomer; conformer
Compound of 異性 (isei, 'different property') + 体 (tai, 'body, form'). The term is a calque from Western chemistry terminology.