You searched for: “detainers
detainer (s) (noun), detainers (pl)
A person, or people, who prevent others from leaving a place: "The police detainers were holding suspects to see who was responsible for the major auto accident on the highway."
This entry is located in the following units: de- (page 42) ten-, tent-, tin-, -tain, -tainment, -tenance, -tinence (page 3)