Definition of "cesium" [cesium]

• A soft, silvery-white ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells and to catalyze hydrogenation of some organic compounds. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1. See Table at element. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""It stands to reason that at some point the Ukrainian government would like to be able to use that land again, but the scientists have calculated that what they call cesium's" ecological half-life "- the time for half the cesium to disappear from the local environment - is between"
• "Corporation and then NSF and used it to thoroughly develop a novel experimental approach for measuring atomic PV in cesium."
• "In the second phase, a drug called cesium fluoride, known to stimulate the enzyme adenylate cyclase, was added to the blood samples, and the activity of the enzyme was measured."