n. — informal, slang
the emergency ward of a hospital; clipping of "emergency".
Type: 1. Origin — The term emerg refers to the the emergency ward or area of a hospital (see the 1982 quotation). While the form is more frequent in the US (see Chart 1), there it refers to different emergency-related services, such as response units.
See also COD-2, s.v. "emerg" which is marked "Cdn slang".
- Often in emerg department and other combinations, see Chart 2 and, e.g, the 1993 quotation.
Images:

Chart 1: Internet Domain Search, 1 Aug. 2012 
Chart 2: Internet Domain Search, 10 Apr. 2014