An obscure term which apparently was used (at least in Fancyclopedia 2) to mean readers of SF who were not connected to fandom.

from Fancyclopedia 1 ca. 1944
Persons who read fantasy, perhaps collect it and even write letters to the pro editors and try their hand at writing stories, but may have little or no contact with the fan world. Likewise there may be local clubs of scientifictionists, like the Outsiders, which are practically never heard of in fandom. All fans are scientifictionists; only certain scientifictionists or fantasts are fans.