Wiktionary
n. A hypothetical world constructed from antimatter.
Usage examples of "antiworld".
Which is like the last sparks of the bonfire, and from which begins the next phase, because, when 'what was reversed' has come to the limit of its 'inside-out' expansion and created an 'antiworld,' and extended it, it begins to contract again and break back through the fissure, first in neutrino radiation, which is the hardest and most stable, because at that point there is no light yet, only, besides the neutrino radiation, ultrahigh gamma!
The signal either was a natural phenomenon, a "last chord" of a dying Universe, hammered out by a "fissure" between world and antiworld onto a neutrino wave.
Within the outer bar was an inner bar, an antiworld where many men and few women sat in arcs staring at hands of cards or kwik crosswords or architect's drawings or lawyers' briefs or escape routes, where bankruptcies and bereavements were entrained by a twingeing shake or nod of some great ruined head, and where, at this moment, behind a mephitic banquette of cigarette smoke, his back turned, Steve Cousins sat talking the higher shop with three bronzed pocked mug shots: the most exalted vil-lainspeak (no detail, just first principles) about getting back what you put in and this being life and this being it .
It surged forward across the rooftops of the city, buildings collapsing in its wake, and struck the heart of the fortress, rending the fabric of spacetime on impact and opening gaps into antiworlds.
Instead of giving you truth, I faked you out, Miss Mueller, and sent you spinning blindly onward to the tarot, to the signs of the zodiac, to the flying-saucer people, to a thousand surreal vibrations, to a million apocalyptic astral antiworlds, when the touch of my mind against yours might have been enough to heal your madness.