tritium


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trit·i·um

 (trĭt′ē-əm, trĭsh′ē-)
n.
A rare radioactive isotope of hydrogen, H-3, having one proton and two neutrons in the nucleus and a half-life of 12.3 years, prepared artificially for use as a tracer and as a constituent of hydrogen bombs.

[From Greek tritos, third; see trei- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tritium

(ˈtrɪtɪəm)
n
(Elements & Compounds) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

trit•i•um

(ˈtrɪt i əm, ˈtrɪʃ-, ˈtrɪʃ əm)

n.
an isotope of hydrogen having an atomic weight of three.
[1930–35; < Greek trít(os) third + -ium2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

trit·i·um

(trĭt′ē-əm, trĭsh′ē-əm)
A radioactive isotope of hydrogen whose nucleus has one proton and two neutrons and whose atomic mass is about 3. Tritium is rare in nature but can be made artificially in nuclear reactions. It is used in thermonuclear weapons and sometimes as a tracer. See more at hydrogen.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tritium

An isotope of hydrogen. Its nucleus contains one proton and two neutrons and thus has a relative atomic mass of three.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tritium - a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms
atomic number 1, H, hydrogen - a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
tritium
tritium

tritium

[ˈtrɪtɪəm] Ntritio m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

tritium

nTritium nt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
M2 PRESSWIRE-August 13, 2019-: Tritium research centre plans move ahead with &pound;5m contract
5 TRUGLO's Tritium Pro night sights offer the glowing green of Tritium, a radioluminescent light source needing no batteries or light exposure --Tritium sights are always on.
But this still contains tritium, a radioactive substance.
(Only the tritium used in its night sights is sourced from outside the U.S., in Switzerland.)
Just announced Is a night-sight version of the company's Big Dot sights that features a large orange or yellow photoluminescent "glow" front-sight dot with a tritium center.
BANKING AND CREDIT NEWS-January 22, 2019-Tritium Partners closes secures Tritium II fund with USD 465m in committed capital
M2 EQUITYBITES-January 22, 2019-Tritium Partners closes secures Tritium II fund with USD 465m in committed capital
Global Banking News-January 22, 2019-Tritium Partners closes secures Tritium II fund with USD 465m in committed capital
17 November 2017 - US-based payroll and human resources service provider Inova Payroll, has closed a recapitalisation with private equity firm Tritium Partners, the company said.
Tokyo Electric Power Company, the operator of the Fukushima Daiichi nuclear plant, says it may dump as much as 770,000 cubic meters of water contaminated with the radioactive tritium into the Pacific Ocean, as part of its cleanup efforts following the 2011 tsunami.
I think the first example of these are sights with tritium inserts that have white-ring outlines.