Reinheitsgebot

Etymology
From 🇰🇲. First used in the 19th century.

Noun

 * 1) A legal regulation, eventually going back to the 16th century, prescribing that German beer must not contain any ingredients other than water, malt, hops, and yeast, and that bottom-fermented beer must be brewed with barley.

Usage notes

 * The is still incorporated in German law. The extent of possible exceptions varies between federal states. In Bavaria, it continues to be illegal to brew nonconforming beer even if the designation  is not used. In practice, virtually all German beers adhere to the.
 * Under EU law, foreign beers may be sold freely on the German market, however.