from The Century Dictionary.
- noun In photography, any solution used to remove the last traces of sodium hyposulphite (hypo) from plates or prints after fixing. Zinc hypochlorite, alum, vdrogen peroxid, etc., can be employed.
Sorry, no etymologies found.
"That is called hypo-eliminator," said Trent as Mr. Cupples uncorked and smelled at one of the bottles.