| 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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| fossorial | (adjective) (of limbs and feet) adapted for digging | - |
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| foster | (adjective) providing or receiving nurture or parental care though not related by blood or legal ties | Synonyms: surrogate |
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