A class of brachiopods, existing from the Lower Cambrian to the present day, in which the shell is chitinophosphatic, the valves are not hinged by teeth and sockets, and the pedicle is thick.
Lingulata
- Fresnel lens
- Fresnel zone
- freta
- Fretted and Chaotic Hummocky Terrain
- fretum
- Freudenthal, Hans (1905–90)
- Freud, Sigmund
- Freud, Sigmund (1856–1939)
- Freundlich adsorption isotherm
- Freundlich, Herbert Max Finlay
- Freundlich isotherm
- Freyberg, Bernard Cyril, 1st Baron (1889–1963)
- Frey’s curve
- friable
- friction
- frictional angle
- frictional electricity
- frictional head
- frictional resistance, angle of
- frictional unemployment
- friction coefficient
- friction drive
- friction factor
- friction of distance
- fried