| Word | Definition |
|---|---|
| faster-than-light adj. (1940) | that is traveling or can travel faster than light |
| faster than light adv. (1928) | at a speed faster than that of light |
| feelie n. (1931) | a motion picture augmented by tactile effects which are felt by the viewer; chiefly in plural (frequently with the): the screening of such pictures; such pictures as a type of entertainment |
| fembot n. (1976) | a robot resembling a woman in appearance; (also) a woman characterized as having robotic behavior or demeanor |
| femmefan n. (1940) | a female fan |
| fen n. (1943) | plural of fan |
| ferry n. (1941) | a small spacecraft used, esp. on a regular schedule, to transport passengers or cargo over a relatively short distance, as between an orbiting craft and a planet’s surface |
| FF n. (No cites) | = fan fiction n. |
| filk n. (1953) | among science fiction and fantasy fans: a type of popular music, commonly performed at fan conventions, characterized by the use of familiar or traditional songs whose lyrics have been rewritten or parodied (usually on themes drawn from science fiction or fantasy literature) |
| filk v. (1978) | among science fiction and fantasy fans: to write or perform filk songs |
| filker n. (1981) | one who sings filk songs; a filk singer n. |
| filking n. (1983) | among science fiction and fantasy fans: the writing or performing of filk songs |
| filksing n. (1968) | a session or event of filk singing |
| filk singer n. (1979) | one who sings filk songs |
| filksinging n. (1965) | the singing of filk songs |
| filk song n. (1953) | a song in the filk style |
| fillo n. (1959) | a small illustration used to fill space, esp. in a fanzine |
| first contact n. (1945) | the first meeting between two different intelligent species |
| fix-up n. (1975) | a novel constructed from shorter material written separately |
| flame gun n. (1934) | a gun (esp. a handgun) that shoots flames; cf. flame pistol n. |
| flame pistol n. (1931) | a pistol that shoots flames; cf. flame gun n. |
| flash crowd n. (2005) | a sudden increase in the number of visitors viewing a (small or niche) website, esp. after the site has been mentioned in a more prominent venue |
| Flash Gordon adj. (1938) | used attributively to indicate something science-fictional, especially relating to or suggestive of stereotypical or hackneyed science fiction; Buck Rogers n. |
| flitter n. (1941) | a small usu. short-range aircraft or spaceship |
| floater n. (1935) | a vehicle or platform that is powered by antigravity, esp. one that flies relatively close to the ground |
| flux capacitor n. (1981) | in the film Back to the Future and its sequels: the core component of the time machine made of a DeLorean automobile |
| flying saucer n. (1947) | any of various unidentified disc- or saucer-shaped objects reported as appearing in the sky, presumed to be of extraterrestrial origin |
| Force n. (1974) | (with the) in the fictional universe of the Star Wars franchise: a mystical universal energy field which certain individuals, such as the Jedi, can harness to gain special powers or abilities |
| force beam n. (1929) | = tractor beam n.; = pressor beam n. |
| force field n. (1931) | a field of force that acts as an invisible barrier |
| force screen n. (1932) | = force field n. |
| frak v. (1978) | (a euphemism for) fuck, in various senses and parts of speech |
| Franken- prefix (1967) | (used to form nouns in the sense ‘created or modified by scientific techniques, esp. genetic engineering’) |
| Frankenstein complex n. (1947) | Isaac Asimov’s term for: the anxiety and distrust humans feel for robots |
| free fall n. (1931) | a condition of weightlessness |
| fresher n. (1940) | a bathroom or shower |
| ftl adj. (1950) | faster than light speed |