a radioactive, metallic chemical element, one of the actinides, produced by bombarding einsteinium with high-energy alpha particles in a cyclotron: symbol, Md; at. no., 101
See mendelevium in American Heritage Dictionary 4
(mĕnˌdə-lēˈvē-əm)
noun Symbol Md
A synthetic radioactive transuranic element of the actinide series that has known isotopes with mass numbers ranging from 245 to 262. The isotopes with the longest half-lives are Md 258 (51.5 days) and Md 260 (31.8 days). Atomic number 101; melting point 827°C; valence 2,3. See Table at element.