/ ˈbiːkə(r); NAmE / noun
1.
( BrE ) a plastic or paper cup, often without a handle, used for drinking from
2.
( BrE ) the amount contained in a beaker :
a beaker of coffee
3.
a glass cup with straight sides and a lip, used in chemistry, for example for measuring liquids
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WORD ORIGIN
Middle English ( large drinking container ): from Old Norse bikarr , perhaps based on Greek bikos drinking bowl.