| FESTILOGIES | • festilogies n. Plural of festilogy. • FESTILOGY n. a treatise on ecclesiastical festivals, also FESTOLOGY. |
| FILOVIRUSES | • filoviruses n. Plural of filovirus. • Filoviruses n. Plural of Filovirus. • FILOVIRUS n. any member of a family of viruses that includes the agents responsible for Ebola virus disease and Marburg disease. |
| FISSIONABLE | • fissionable adj. Capable of undergoing nuclear fission; fissile. • fissionable n. Any fissile or fissionable substance. • FISSIONABLE adj. that can undergo fission. |
| FLORISTRIES | • FLORISTRY n. the art of cultivating and selling flowers. |
| FLUORIDISES | • fluoridises v. Third-person singular simple present indicative form of fluoridise. • FLUORIDISE v. to add fluoride to drinking water, also FLUORIDIZE. |
| FLUXIONISTS | • fluxionists n. Plural of fluxionist. • FLUXIONIST n. one skilled in fluxions. |
| FOSSILISING | • fossilising v. Present participle of fossilise. • FOSSILISE v. to turn into a fossil, also FOSSILIZE. |
| FOSSILIZING | • fossilizing v. Present participle of fossilize. • FOSSILIZE v. to turn into a fossil, also FOSSILISE. |
| ICHNOFOSSIL | • ichnofossil n. (Paleontology) A trace fossil; a fossil record that preserves some activity of an organism, but no part… • ICHNOFOSSIL n. a fossil footprint. |
| MICROFOSSIL | • microfossil n. A microscopic fossil. • MICROFOSSIL n. a very small fossil. |
| PILOTFISHES | • pilotfishes n. Plural of pilotfish. • pilot␣fishes n. Plural of pilot fish. • PILOTFISH n. a tropical fish. |
| SOLEMNIFIES | • solemnifies v. Third-person singular simple present indicative form of solemnify. • SOLEMNIFY v. to make solemn. |
| SOLIDIFIERS | • solidifiers n. Plural of solidifier. • SOLIDIFIER n. one who solidifies. |
| SOLIFIDIANS | • solifidians n. Plural of solifidian. • SOLIFIDIAN n. one who maintains that only faith can bring redemption. |