an acid bath or rinse for stopping the action of a developer before fixing a negative or print.
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Origin of stop bath
First recorded in 1915–20
Also called shortstop, shortstop bath.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for stop bath
a weakly acidic solution used in photographic processing to stop the action of a developer on a film, plate, or paper before the material is immersed in fixer
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