comember

noun

co·​mem·​ber ˌkō-ˈmem-bər 

variants or co-member

plural comembers or co-members

: one of two or more members of a group : a fellow member

the newest comember of the troupe

… Durham and his committee co-members still are planning more growth beyond Europe.

—Business Week

Word History

First Known Use

1798, in the meaning defined above