1. A soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
   - promethium, Pm

Type of: metal, metallic element

• imaginary number
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• imaginary part of a complex number
• imaginary place
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• Imamu Amiri Baraka
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• imbalance
• imbalanced
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• imbecile
• imbecilic