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 6 July, 2008

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.