n.someone (physician or clergyman) who substitutes temporarily for another member of the same profession
同义词：locum
英汉双解大词典
locum tenens/ˈləʊkəm ˈtiːnɛnz/
1.
N（名词）
a person who stands in temporarily for another member of the same profession, esp for a physician, chemist, or clergyman (尤指医生、药剂师或牧师的)临时代理 (Often shortened to locum) [英国英语]