| fossa | (noun) largest carnivore of Madagascar; intermediate in some respects between cats and civets | Synonyms: Cryptoprocta ferox, fossa cat |
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| (noun) a concavity in a surface (especially an anatomical depression) | Synonyms: pit |
| fosse | (noun) ditch dug as a fortification and usually filled with water | Synonyms: moat |
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| fossil | (adjective) characteristic of a fossil | - |
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| (noun) the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil | - |
| (noun) someone whose style is out of fashion | Synonyms: dodo, fogey, fogy |
| fossiliferous | (adjective) bearing or containing fossils | - |
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| fossilisation | (noun) becoming inflexible or out of date | Synonyms: fossilization |
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| (noun) the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone | Synonyms: fossilization |
| fossilise | (verb) convert to a fossil | Synonyms: fossilize |
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| (verb) become mentally inflexible | Synonyms: fossilize |
| fossilised | (adjective) set in a rigidly conventional pattern of behavior, habits, or beliefs | Synonyms: fossilized, ossified |
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| fossilist | (noun) a specialist in paleontology | Synonyms: palaeontologist, paleontologist |
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| fossilization | (noun) becoming inflexible or out of date | Synonyms: fossilisation |
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| (noun) the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone | Synonyms: fossilisation |
| fossilize | (verb) convert to a fossil | Synonyms: fossilise |
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| (verb) become mentally inflexible | Synonyms: fossilise |
| fossilized | (adjective) set in a rigidly conventional pattern of behavior, habits, or beliefs | Synonyms: fossilised, ossified |
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| fossilology | (noun) the earth science that studies fossil organisms and related remains | Synonyms: palaeontology, paleontology |
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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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| (verb) help develop, help grow | Synonyms: nurture |
| (verb) promote the growth of | Synonyms: cultivate, further |
| (verb) bring up under fosterage; of children | - |
| fosterage | (noun) helping someone grow up to be an accepted member of the community | Synonyms: breeding, bringing up, fostering, nurture, raising, rearing, upbringing |
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| (noun) encouragement; aiding the development of something | Synonyms: fostering |
| fostering | (noun) helping someone grow up to be an accepted member of the community | Synonyms: breeding, bringing up, fosterage, nurture, raising, rearing, upbringing |
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| (noun) encouragement; aiding the development of something | Synonyms: fosterage |
| fosterling | (noun) a child who is raised by foster parents | Synonyms: foster-child, foster child |
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