Definition of baker's salt in English:

baker's salt

(also bakers' salt)

noun

  • 1A powdered mineral substance, especially an adulterant containing alum, added to bread to improve colour and add bulk (now historical).

  • 2Ammonium carbonate, occasionally used as a raising agent in place of baking soda.

  • 3Salt (sodium chloride) prepared for use in commercial bakery, especially by enrichment with potassium iodide.

Origin

Early 19th century; earliest use found in The Sun.