'Beaker' definitions:

Definition of 'beaker'

noun

A flatbottomed jar made of glass or plastic; used for chemistry

noun

A cup (usually without a handle)

From: GCIDE

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]