bk

Multiple Entries:
  bk    Bk    berkelium  

Concise Oxford English Dictionary © 2008 Oxford University Press:
bk

▶abbreviation book.

Concise Oxford English Dictionary © 2008 Oxford University Press:
Bk

▶symbol the chemical element berkelium.

Concise Oxford English Dictionary © 2008 Oxford University Press:
berkelium /bəːˈkiːlɪəm, ˈbəːklɪəm/

▶noun the chemical element of atomic number 97, an unstable radioactive metal of the actinide series. (Symbol: Bk)

– origin 1949: from the University of Berkeley in California (where it was first made) + -ium.