ˌmisˈuser

/ ˌmɪsˈjuːzə /

noun

1. law an abuse of some right, privilege, office, etc, such as one that may lead to its forfeiture
2. often in combination a person who regularly abuses alcohol, drugs, etc

   heroin misusers

Word History and Origins

Origin of ˌmisˈuser¹

C17: from Old French mesuser (infinitive used as noun)