This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A wide cylindrical glass vessel with a pouring lip, used as a laboratory container and mixing jar.

n. A large drinking cup with a wide mouth.

n. The quantity that a beaker holds.

n. A flat-bottomed vessel, with a lip, used as a laboratory container.

n. A drinking vessel without a handle, sometimes for the use of children.

n. A mug.

n. A large drinking cup, with a wide mouth, supported on a foot or standard.

n. An open-mouthed, thin glass vessel, having a projecting lip for pouring; -- used for holding solutions requiring heat.

n. A large drinking-vessel with a wide mouth.

n. A glass vessel used by chemists, usually for making solutions.

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

n. a cup (usually without a handle)

"What's going on in the beaker is actually quite a complex set of chemical reactions."

jar    cup   

beaker people   

glass   

Speaker    bleaker    leaker    meaker    meeker    seeker    sleeker    sneaker    speaker    squeaker   

goblet    mug    flask    tumbler    tankard    flagon    decanter    sip    keg    jar