| dissilient | (adjective) bursting open with force, as do some ripe seed vessels | - |
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| 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 |
| fossil | (adjective) characteristic of a fossil | - |
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| fossiliferous | (adjective) bearing or containing fossils | - |
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| fossilised | (adjective) set in a rigidly conventional pattern of behavior, habits, or beliefs | Synonyms: fossilized, ossified |
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| fossilized | (adjective) set in a rigidly conventional pattern of behavior, habits, or beliefs | Synonyms: fossilised, ossified |
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| nonfissile | (adjective) not fissile | - |
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| sessile | (adjective) attached directly by the base; not having an intervening stalk | Synonyms: stalkless |
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| (adjective) permanently attached to a substrate; not free to move about | - |