coprisoner

noun

co·​pris·​on·​er ˌkō-ˈpriz-nər 

-ˈpri-zᵊn-ər

variants or co-prisoner

plural coprisoners or co-prisoners

: a fellow prisoner

Among his co-prisoners in Vietnam was future Arizona senator and Republican presidential candidate John McCain, whose Navy aircraft was shot down over Vietnam in 1967. McCain and Bell were in the same compound at one point and had given each other haircuts.

—Bart Barnes

Word History

First Known Use

1837, in the meaning defined above