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English word
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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun berkelium has 1 sense
- berkelium(n = noun.substance) atomic number 97, bk - a radioactive transuranic element; discovered by bombarding americium with helium; is a kind of metal, metallic element
CIDE DICTIONARY
berkelium, n. [from the city of Berkeley , California, location of the University of California campus where it was discovered.].
a chemical element of the transuranic series. Chemical symbol Bk; atomic number 97; atomic weight 247. It is a radioactive element, with no stable isotopes; the longest-lived isotope is of mass number 247.07, decaying by alpha-emission with a half-life of 1,400 years. The isotope with atomic weight 249 has a half-life of 314 days, and was isolated in weighable quantities. [WordNet 1.5]
OXFORD DICTIONARY
berkelium, n. Chem. a transuranic radioactive metallic element produced by bombardment of americium.
Usage
Symb.: Bk.
Etymology
mod.L f. Berkeley in California (where first made) + -IUM