noun Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Ds; atomic number: 110.
Origin of darmstadtium
Formerly ununnilium, element 110.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A synthetic radioactive element, first produced by bombarding lead atoms with nickel atoms. It has a mass number of 281, and its most stable isotope has a half-life of over one minute. Atomic number 110. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.