allergy: [20] Allergy was borrowed from German allergie, which was coined in 1906 by the scientist C E von Pirquet. He formed it from Greek allos ‘other, different’ and érgon ‘work’ (source of English energy and related to English work). Its original application was to a changed physiological condition caused by an injection of some foreign substance. => energy, work[allergy etymology, allergy origin, 英语词源]