n., pl., -nies.
A loose short-sleeved gown opening in the back, worn by patients undergoing medical treatment or examination.
[From the name Johnny, nickname for John.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
