as stated above; also. Part of a thermoneculear bomb. IT is sent into fusion by way of a fissile reaction. (Uranium bomb, plutonium gun) Then it procedes to be setn off by the extreme heat and presure into fusion to form He-3. The end result is KA FUCKING BOOOM!
Fat boy was a plutonium gun of about 750Kton. Mike was a tritium fusion bomb, about 10Mtonnes.
by He who arises in might April 07, 2004

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Top Definition
a low energy beta emmitting isotope of hydrogen containing 2 neutrons and 1 proton.
i spilled tritium on myself but didn't worry about it because the radiated particles aren't energetic enough to penetrate the layer of dead skin that covers my body
by James October 24, 2003

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Irradiated gas utilized in military instruments and timepieces for the sole purpose of lighting dials or numbers during times of complete darkness.

This gas emits enough light for easy reading of a timepiece in compete darkness and will last for 25 or more years.
I have a Marathon T-SAR watch that uses tritium gas to light the numbers so that I can see them in the dark.
by shailoche August 12, 2009

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About the most expensive fucking thing on the planet. Used in watches and gun sights to make them glow.
No example needed, you tosser.
by proud2deviate April 09, 2004

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A very intelligent person and great singer. Loves a variety of musicals and shows such as Lost and Bones.
Basically one of the most awesomest people on the planet.
Tritium is a great friend and has amazing hair.
by Moony_ April 06, 2008

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