American Heritage® Dictionary of the English Language, Fourth 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.
GNU Webster's 1913
- adj. (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.
- 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)
- 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)
- After Dmitri Ivanovich Mendeleev. (American Heritage® Dictionary of the English Language, Fourth Edition)
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