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locum

noun [C]
 
/ˈləʊ.kəm/ US  /ˈloʊ-/ mainly UK

Definition

a doctor who does the job of another doctor who is ill or on holidayReplacing and exchangingDoctors and health workers generally
(Definition of locum noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of locum