tritium
(noun) a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms
Source: WordNet® 3.1
tritium (plural tritiums)
(isotope) A radioactive isotope of the element hydrogen (symbol T or 31H) having one proton and two neutrons.
An atom of this isotope.
• T (chemical symbol), hydrogen-3
• hydrogen
• (isotopes of hydrogen): protium, deuterium, quadrium
• ittrium
Source: Wiktionary
24 February 2025
(noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)
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