a large drinking cup or glass with a wide mouth.
contents of a beaker: consuming a beaker of beer at one gulp.
a flat-bottomed cylindrical container, usually with a pouring lip, especially one used in a laboratory.
(initial capital letter) of or pertaining to the Beaker folk.

1300–50; alteration of Middle English biker < Old Norse bikarr < Old Saxon bikeri (compare Old High German bechari, German Becher, Dutch beker) < Latin *bic(c)arium, -ius, of disputed orig. See pitcher1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
beaker (ˈbiːkə)
1.  a cup usually having a wide mouth: a plastic beaker
2.  a cylindrical flat-bottomed container used in laboratories, usually made of glass and having a pouring lip
3.  the amount a beaker holds
[C14: from Old Norse bikarr; related to Old High German behhāri, Middle Dutch bēker beaker, Greek bikos earthenware jug]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-14c., from O.N. bikarr or M.Du. beker "goblet," probably from M.L. bicarium, which itself is probably a dim. of Gk. bikos "earthenware jug, wine jar" (said to be an oriental word, perhaps a borrowing from Syrian buqa "a two-handed vase or jug"). Form assimilated to beak.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
beaker   (bē'kər)  Pronunciation Key 
A wide, cylindrical glass container with a pouring lip, used especially in laboratories.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He noticed that the goo left behind in a beaker after one of his experiments
  had hardened into a tough polymer.
Afterward, use a spatula to tap the beaker and loosen the lava from its sides.
Remove the wire gauze and rinse the beaker with water.
When all three are put in a beaker and mixed with distilled water, the peas'
  cellular structure starts to break down.
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