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tritium definition

trit·ium (trit′ē əm)

noun

a radioactive isotope of hydrogen having an atomic weight of 3 and a half-life of c. 12.5 years: it decays by beta-particle emission and is used in thermonuclear bombs, thermonuclear fusion devices, as a radioactive tracer, etc.

Etymology: ModL < Gr tritos, third + -ium

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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