The American Heritage® Dictionary of the English Language, 4th Edition
n. A soft, silvery rare-earth element used in nuclear research. Atomic number 66; atomic weight 162.50; melting point 1,407°C; boiling point 2,600°C; specific gravity 8.536; valence 3. See Table at element.
n. A metallic chemical element (symbol Dy) with an atomic number of 66.
the GNU version of the Collaborative International Dictionary of English
n. An element of the rare earth-group. Symbol Dy; at. wt., 162.5.
The Century Dictionary and Cyclopedia
n. In chem., one of the supposedly distinct elements of the yttrium group contained in samarskite and gadolinite, closely related to holmium, but distinguished from it by a special absorption-spectrum.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic
Word Usage
"A material known as dysprosium, used in magnets for wind turbines and electric vehicles, is particularly important to the clean-technology sector."