Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for caesium from the 1913 edition of Webster's Revised Unabridged Dictionary. Define caesium using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 1
1. A rare alkaline metal found in mineral water; - so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro- positive substance known. Symbol Cs.
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