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单词 cesium
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ce•si•um  (sē′zē əm),USA pronunciation n. 
  1. Chemistrya rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs;
    at. wt.: 132.905;
    at. no.: 55;
    sp. gr.: 1.9 at 20°C;
    melts at 28.5°C.
Also, caesium. 
  • Neo-Latin, special use of Latin caesium, neuter of caesius bluish-grey; see -ium
  • 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::
cesium /ˈsiːzɪəm/ n
  1. the usual US spelling of caesium
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