American Heritage® Dictionary of the English Language, Fourth Edition
- n. An artificially produced radioactive element with atomic number 109 whose most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Also called unnilennium. See Table at element.
- n. a radioactive transuranic element
- Named for Lise Meitner (Wiktionary)
- After Lise Meitner. (American Heritage® Dictionary of the English Language, Fourth Edition)
“First, we learn about the brave physicist after whom meitnerium is named.”
“An element discovered in 1982 has been named meitnerium to honor Lise Meitner (1878-1968), the Austrian-Swedish physicist and mathematician who discovered the element protactinium and made major contributions to the understanding of nuclear fission.”
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