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单词 rubidic
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ru•bid•i•um  (ro̅o̅ bidē əm),USA pronunciation n. [Chem.]
  1. Chemistrya silver-white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb;
    at. wt.: 85.47;
    at. no.: 37;
    sp. gr.: 1.53 at 20°C.
  • Neo-Latin, equivalent. to Latin rūbid(us) red (in allusion to the two red lines in its spectrum) + -ium -ium
  • 1860–65
ru•bidic, adj. 

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