Historical Dictionary of Science Fiction

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Word Definition
xenocide n. (1973) the killing or attempted killing of an entire alien species; the killing of an individual alien; (also) a person who commits this act
xenolinguist n. (1955) one who studies alien languages
xenological adj. (1950) of, or relating to, xenology
xenologist n. (1949) one who studies xenology n.
xenology n. (1954) the scientific study of aliens, esp. xenobiology n.
xenopsychologist n. (1980) an expert in xenopsychology n.
xenopsychology n. (1972) the psychology of alien races
X-Phile n. (1994) a fan of the TV show The X-Files
zap gun n. (1934) = ray gun n.
zero-g n. (1940) = zero-gravity n.
zero-gravity n. (1938) the state or condition in which there is no apparent force of gravity acting on a body, either because the force is locally weak, or because both the body and its surroundings are freely and equally accelerating under the force
zine n. (1941) = fanzine n.