Definition
A heavy, naturally occurring radioactive metallic element (atomic number 92) used as the primary fuel for nuclear reactors and as a dense shielding or counterweight material in some aircraft applications.
Plain English
A heavy, slightly radioactive metal. Because it is so dense, small pieces of it weigh a lot, which makes it useful as a counterweight in some aircraft control surfaces.
Context Anchor
Seen in aircraft maintenance records, hazardous-materials guidance, and discussions of balance weights or ballast in some aircraft.
Derivation
Named after the planet Uranus, which had been discovered shortly before the element was identified in 1789. Knowing this just explains the name; it does not change the practical meaning.
Why Pilots Care
Depleted uranium counterweights allow precise control-surface or component balancing in limited space while meeting strict handling regulations.
Intuition Check
Do not assume uranium in an aircraft means the airplane is nuclear-powered. In this context, it usually means a very dense material used as a weight in a specific component.
Example Sentence 1
The maintenance manual called for special handling procedures when removing the depleted uranium counterweight from the elevator.
Example Sentence 2
Special procedures apply whenever maintenance involves removing or installing uranium ballast in the rudder.