Sentence:  -- "I suppose you wouldn't like to do a <WSD>locum</WSD> for a month on the South coast? Three guineas a week with board and lodging." -- "I wouldn't mind," said Philip. -- "It's at Farnley, in Dorsetshire. Doctor South. You'd have to go down at once; his assistant has developed mumps. I believe it's a very pleasant place." 
Meaning of the word marked with <WSD> tags:  (locum tenens)<ref name="COED-pron&def">The '''Concise Oxford English Dictionary''' [Eleventh Edition]</ref>