tritium - Dictionary definition and pronunciation - Yahoo! Education
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trit·i·um  audio  (trt-m, trsh-) KEY 

NOUN:
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.
ETYMOLOGY:
From Greek tritos, third; see trei- in Indo-European roots


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