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The Collaborative International Dictionary of English v.0.48 (gcide)

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.]
(Chem.)
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.
--HCP61
[PJC]