noun ·Moderate ·College level

Definitions

Noun

1. 1
   Any of two or more compounds with the same molecular formula but with different structure. physical
2. 2
   a compound that exists in forms having different arrangements of atoms but the same molecular weight wordnet
3. 3
   Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.

Synonyms

All synonyms

nuclear isomeracidacidityagentalkalialkalinity

Etymology

From iso- + -mer.

Related phrases

cis-trans isomerendo-isomerexo-isomergeometric isomerisomer bombmetastable isomernuclear isomeroptical isomerpositional isomerstructural isomervalence isomeratomic number

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.