from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative spelling of caesium.
from the GNU version of the Collaborative International Dictionary of English
- n. the chemical element of atomic number 55. It is a univalent element, the most electropositive metal. Symbol Cs; atomic weight 132.905. IT has a melting point of 28.4° C.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
From Latin caesius, bluish gray (from its blue spectral lines).(American Heritage® Dictionary of the English Language, Fourth Edition)