tritium

[trit-ee-uhm, trish-, trish-uhm]
noun Chemistry.
an isotope of hydrogen having an atomic weight of three.

Origin:
1930–35; < Neo-Latin < Greek trít(os) third (tri- tri- + -tos adj. suffix) + Neo-Latin -ium -ium

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World English Dictionary
tritium (ˈtrɪtɪəm)
 
n
a radioactive isotope of hydrogen, occurring in trace amounts in natural hydrogen and produced in a nuclear reactor. Tritiated compounds are used as tracers. Symbol: T or ³H; half-life: 12.5 years
 
[C20: New Latin, from Greek tritos third]

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American Heritage
Medical Dictionary

tritium trit·i·um (trĭt'ē-əm, trĭsh'ē-)
n.
Symbol T
A rare radioactive hydrogen isotope with atomic mass 3 and half-life 12.5 years, prepared artificially for use as a tracer and as a constituent of hydrogen bombs. Also called hydrogen-3.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
tritium   (trĭt'ē-əm, trĭsh'ē-əm)  Pronunciation Key 
A radioactive isotope of hydrogen whose nucleus has one proton and two neutrons with atomic mass of about 3 and a half life of 12.5 years. Tritium is rare in nature but can be made artificially in nuclear reactions. It is used in thermonuclear weapons and luminescent paints, and sometimes as a tracer. See more at hydrogen.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When a warhead detonates, it squeezes the deuterium and tritium until they fuse
  together.
As for the amount of tritium leaked you are so utterly drastically wrong it
  isn't even funny.
Since tritium is highly radioactive, that makes containment a big problem as
  structures weaken and need to be replaced.
What's more, so far they haven't included the deuterium and tritium fuel in the
  capsule for the tests.
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