actinium

Từ điển Oxford Learners Wordfinder Dictionary

noun

a radioactive element of the actinide series;
found in uranium ores
• Syn:
Ac, atomic number 89
• Hypernyms:
chemical element, element
• Substance Holonyms:
uranium ore

• Từ đồng nghĩa / Synonyms:
  Ac, atomic number 89