noun Chemistry, Physics.
Examples from the Web for plutonium
When my oldest child was a toddler, I treated illuminated screens like plutonium.Yes, Your Toddler Can Watch TV: The New Rules for Screen Time|Russell Saunders|December 26, 2014|DAILY BEAST
The plutonium was sent to a place called the Plutonium Finishing Plant.
So was the plutonium that went into the construction of the nuclear bomb Fat Man, which was detonated over Nagasaki.
Possibly as triumphant as ending World War II with a bomb made from plutonium developed here.
I drank an International Proton Pale Ale and opted not to follow it up with a Plutonium Porter.
Los Alamos scientists devised two designs for an atomic bomb--one using the uranium and another using the plutonium.
The core of the bomb consisted of two hemispheres of plutonium, (Pu-239), and an initiator.Trinity [Atomic Test] Site|The National Atomic Museum
Rip added it to the front of the plutonium wedge, along with a piece of beryllium from the bomb, and Kemp welded it in place.Rip Foster in Ride the Gray Planet|Harold Leland Goodwin
This resulted in the formation of 200 micrograms of plutonium.
After letting the temperatures of the plutonium and casing equalize the core slid smoothly into place.