| fissio | a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy |
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| fissio | reproduction of some unicellular organisms by division of the cell into two more or less equal parts |
| fissio | a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element (uranium 235 or plutonium 239)) |
| fissio | (physics) capable of undergoing nuclear fission |