tritium

[trit-ee-uhm, trish-, trish-uhm]

trit·i·um

[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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Tritium is always a great word to know.
So is addition. Does it mean:
a reaction in which two or more substances combine to form another compound
a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH3, usually produced by the combination of nitrogen and hydrogen gases
Collins
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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