althist

Probably a clipping of althistory, itself a clipping of alternate history. Analysable as alt +‎ hist.

althist (plural althists)

1. (Internet slang, fandom slang) Synonym of alternate history (“a genre of fiction based around or involving ahistorical events”)
   • 1997 October 10, Cairo, “Alt History Book Reviews”, in alt.history.what-if‎ (Usenet):

     I read the following: […] there's a book of micheal moorcock on althists, which isn't too good

   • 2010 April 8, Lord_Vexacus, Twitter‎:

     Turtledove is the master of AltHist. I just wish he'd do a decent Japanowank series

   • 2023 June 9, u/TechnologyBig8361, “What's a (real) country that sounds like it was created for someone's althist project?”, in r/AlternateHistory‎, Reddit:

     [see title]

• allohistory
• alternative history
• althistory