from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A synthetic radioactive transuranic element of the actinide series. Atomic number 101; mass numbers 256 and 258; half-lives approximately 1.3 hours (Md 256) and 51.5 days (Md 258). See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A transuranic chemical element (symbol Md, formerly Mv) with atomic number 101.

from the GNU version of the Collaborative International Dictionary of English

  • adj. 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 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)


After Dmitri Ivanovich Mendeleev.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after the scientist Dmitri Mendeleev, who is the creator of the periodic table. The same name was proposed, but rejected, for the earlier-discovered elements berkelium and erbium. (Wiktionary)


  • Element number 101 is named mendelevium in his honor.

    MAKE Magazine

  • He heedlessly bores through helium, mercury, ytterbium, molybdenum, and more until he reaches mendelevium-and her last nerve.

    Slate Magazine


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