Dictionary.com
Thesaurus.com

zambuck

British  
/ ˈzæmbʌk /

noun

  1. informal  a St John ambulance attendant, esp at a sports meeting

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of zambuck

C20: from Zam-Buck, the trade name of an ointment which comes in a black-and-white container, black and white being the colours of the St John uniform