Full record for slan n.

Definition a mutated human with extraordinary powers; used by science fiction fans to refer to themselves with reference to their supposed higher intelligence
OED requirements antedating 1940
Earliest cite A. E. van Vogt 'Slan'
Last modified 30 July, 2019

Citations for slan n.

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1959 R. Eney Fancyclopaedia II (1979) 33 A confabulation is an informal meeting larger than a mere fan visit but not built up or conducted like a conference; the word is pretty near obsolete, but popular in the early 40s. The most important thing about a con is that the slans can get together with their own kind of people, perhaps forgetting their introversion for a while, and do what they want to do and fangab about mutually interesting things and develop their stfnic personalities.