iˈsomēre noun (zoology)

An organ or segment corresponding to or homologous with another

isomeric /-merˈik/ adjective (chem)

1. Identical in percentage composition and molecular weight but different in constitution or structure
2. (of nuclei) differing only in energy state and half-life

isomˈerism noun

1. The property of being isomeric
2. The existence of isomers

isomerīzāˈtion or isomerīsāˈtion noun

isomerize or isomerise /ī-somˈər-īz/ transitive verb and intransitive verb

To change into an isomer

isomˈerous adjective (botany)

Having the same number of parts (esp in floral whorls)