| fissile | (adjective) capable of being split or cleft or divided in the direction of the grain | - |
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| (adjective) capable of undergoing nuclear fission | Synonyms: fissionable |
| fission | (noun) a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy | Synonyms: nuclear fission |
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| (noun) reproduction of some unicellular organisms by division of the cell into two more or less equal parts | - |
| fissionable | (adjective) capable of undergoing nuclear fission | Synonyms: fissile |
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| fissiparity | (noun) the tendency to break into parts | - |
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| (noun) reproduction of some multicellular organisms by division, as in the case of some starfish | - |
| fissiparous | (adjective) reproducing by fission | - |
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| (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: breakaway, separatist |
| fissiped | (noun) terrestrial carnivores having toes separated to the base: dogs, cats, bears, badgers, raccoons | Synonyms: fissiped mammal |
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| fissure | (noun) (anatomy) a long narrow slit or groove that divides an organ into lobes | - |
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| (noun) a long narrow cleft | Synonyms: cleft, crack, crevice, scissure |
| (noun) a long narrow depression in a surface | Synonyms: chap, crack, cranny, crevice |
| (verb) break into fissures or fine cracks | - |