tritium
tri.ti.um \'trit-e--*m, 'trish-e--\ n [NL, fr. Gk tritos third - more at THIRD] : a radioactive isotope of hydrogen with atoms of three times the mass of ordinary light hydrogen atoms
tri.ti.um \'trit-e--*m, 'trish-e--\ n [NL, fr. Gk tritos third - more at THIRD] : a radioactive isotope of hydrogen with atoms of three times the mass of ordinary light hydrogen atoms