The Collaborative International Dictionary of English v.0.48:

Lager beer \La"ger beer`\n. [G. lager bed, storehouse + bier
   beer. See Lair, and Beer.]
   Originally a German beer, but now also made in immense
   quantities in the United States; -- so called from its being
   laid up or stored for some months before use.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Beer \Beer\, n. [OE. beor, ber, AS. be['o]r; akin to Fries.
   biar, Icel. bj?rr, OHG. bior, D. & G. bier, and possibly E.
   brew. [root]93, See Brew.]
   1. A fermented liquor made from any malted grain, but
      commonly from barley malt, with hops or some other
      substance to impart a bitter flavor.
      [1913 Webster]

   Note: Beer has different names, as small beer, ale,
         porter, brown stout, lager beer, according to its
         strength, or other qualities. See Ale.
         [1913 Webster]

   2. A fermented extract of the roots and other parts of
      various plants, as spruce, ginger, sassafras, etc.
      [1913 Webster]

   Small beer, weak beer; (fig.) insignificant matters. "To
      suckle fools, and chronicle small beer." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lager beer
    n 1: a general term for beer made with bottom fermenting yeast
         (usually by decoction mashing); originally it was brewed in
         March or April and matured until September [syn: lager,
         lager beer]