Word of the day: locum tenens

The word of the day is locum tenens:

a temporary substitute, especially for a doctor or member of the clergy. (http://dictionary.reference.com/browse/locum+tenens)

"I did some locum tenens work and then got into the new field of radioisotopes and radioisotope drugs."

 - Frances Kelsey, "Autobiographical Reflections", 2014 (http://www.fda.gov/downloads/AboutFDA/WhatWeDo/History/OralHistories/SelectedOralHistoryTranscripts/UCM406132.pdf)