NOUN (2)

1. a flatbottomed jar made of glass or plastic; used for chemistry;

2. a cup (usually without a handle);

The Collaborative International Dictionary of English v.0.48:

Beaker \Beak"er\ (b[=e]k"[~e]r), n. [OE. biker; akin to Icel.
   bikarr, Sw. b[aum]gare, Dan. baeger, G. becher, It.
   bicchiere; -- all fr. LL. bicarium, prob. fr. Gr. bi^kos wine
   jar, or perh. L. bacar wine vessel. Cf. Pitcher a jug.]
   1. A large drinking cup, with a wide mouth, supported on a
      foot or standard.
      [1913 Webster]

   2. An open-mouthed, thin glass vessel, having a projecting
      lip for pouring; -- used for holding solutions requiring
      heat. --Knight.
      [1913 Webster]

WordNet (r) 3.0 (2006):

beaker
    n 1: a flatbottomed jar made of glass or plastic; used for
         chemistry
    2: a cup (usually without a handle)