the chemical element of atomic number 101, a radioactive metal of the actinide series. It does not occur naturally and was first made in 1955 by bombarding einsteinium with helium ions. (Symbol: Md)
Origin:
1950s: modern Latin, from the name of D. Mendeleev (see Mendeleev, Dmitri)
mendelevium in other Oxford dictionaries
Definition of mendelevium in the US English dictionary
