Pronunciation: (dis-prō'sē-um, -shē-), [key]
a rare-earth metallic element, highly reactive and paramagnetic, found in small amounts in various rare-earth minerals, as euxenite and monazite: used to absorb neutrons in nuclear reactors. Symbol: Dy; at. wt.: 162.50; at. no.: 66.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.