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3 definitions found
 for mendelevium
From The Collaborative International Dictionary of English v.0.48 :

  mendelevium \men*de*le"vi*um\ (m[e^]n*d[e^]*l[=e]"v[=e]*[u^]/m),
     a. [From Dmitri Mendeleyev, discoverer of the periodic law.]
     an unstable radioactive element discovered in 1955 and
     produced artificially only in very small quantities; symbol
     Md (also Mv). It is a transuranic element with atomic number
     101. Isotopes 255, 256, 257, and 258 have been prepared.
     Md258, the longest-lived, has a half-life of two months.

From WordNet (r) 3.0 (2006) :

      n 1: a radioactive transuranic element synthesized by bombarding
           einsteinium with alpha particles (Md is the current symbol
           for mendelevium but Mv was formerly the symbol) [syn:
           mendelevium, Md, Mv, atomic number 101]

From The Elements (07Nov00) :

  Symbol: Md
  Atomic number: 101
  Atomic weight: (256)
  Radioactive metallic transuranic element. Belongs to the actinoid
  Only known isotope, Md-256 has a half-life of 1.3 hours. First
  by Glenn T. Seaborg, Albert Ghiorso and associates in 1955. Alternative
  name unnilunium has been proposed. Named after the 'inventor' of the
  periodic table, Dmitri Mendeleev.

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