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

  1. an isotope of hydrogen having an atomic weight of three. Symbols:3H, T

Origin of tritium

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

Words Nearby tritium Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use tritium in a sentence

  • Wanted to trade all the tritium we'd need to blow up a planet just for trees; because they worshipped trees!

  • Another kind, which can be made in a nuclear reactor, is called tritium.

    The Caves of Fear | John Blaine

British Dictionary definitions for tritium


/ (ˈtrɪtɪəm) /

  1. 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

Origin of tritium

C20: New Latin, from Greek tritos third

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for tritium


[ trĭtē-əm, trĭshē-əm ]

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.