From Longman Dictionary of Contemporary Englishmissing personˌmissing ˈperson noun (plural missing persons) [countable] SCPDISAPPEARsomeone who has disappeared and whose family has asked the police to try to find them
Examples from the Corpus
missing person• Another missing person to look for, too.• All this time Bob Southwell had been appraising the place from the point of view of the missing person enquiry.• There is an urge to recapture the missing person in some way by hanging on to memories, and treasures. 