depleted uranium

US /dɪˌpliːtɪd ˈjʊr.eɪ.ni.əm/
UK /dɪˌpliːtɪd ˈjʊr.eɪ.ni.əm/
"depleted uranium" picture
1.

uranium with a lower percentage of the fissile isotope uranium-235 than natural uranium, used in armor-piercing ammunition and armor plating

:
The tank's armor was reinforced with depleted uranium.
Concerns have been raised about the health effects of depleted uranium munitions.