A locum is a doctor — or, less often, a priest — who does someone else’s job for a while, while that person is on holiday, ill, or between posts. In British hospitals the word is everyday: “We have a locum this week.” American English uses it less; people there more often say a temp or a substitute. Though actually the old full name is locum tenens, Latin for “one holding the place,” and locum is the short form staff say without thinking. It names a person, not a place. The job can last days or months. It is a workplace word, a little formal on the page, quite ordinary in a clinic.

代診醫師；代理牧師