lager (n.)youdaoicibaDictYouDict
1858, American English, short for lager beer (1845), from German Lagerbier "beer brewed for keeping" some months before being drunk, from Lager "storehouse" (see lair) + Bier "beer."
pilsner (n.)youdaoicibaDictYouDict
type of pale, hoppy lager beer, 1877, after Pilsen, German town in Bohemia (Czech Plzen) where it first was brewed. Now designating a type, not an origin; pilsner from Plzen is Pilsner Urquell, from German Urquell "primary source." The place name is from Old Czech plz "damp, moist." Related: Pils.
PilsyoudaoicibaDictYouDict
"A type of lager beer similar to Pilsner", 1960s: abbreviation of Pilsner.