Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Darmstadtium" Definition
noun
An artificially produced radioactive element with atomic number 110 and a mass number of 281, whose most stable isotope has a half-life of over one minute. see table at element.
Source: American Heritage Dictionary
A transuranic chemical element (symbol ds) with atomic number 110.
Source: Wiktionary
A radioactive transuranic element.
Source: Wordnet
A short-lived radioactive element produced artificially .
Source: Merriam-Webster
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