ESP + -er from extrasensory perception.
esper (plural espers)
- A person who practices the development of psychic ability.
- (chiefly science fiction) A person supposed to have paranormal abilities.
1942 June 1, Smith, Edward Elmer, “Storm Cloud on Deka”, in Astonishing Stories, volume 3, number 4:
I don't know why anybody would be spying on me, either, but—I'm neither a Lensman nor an esper, but I'd swear that somebody's peeking over my shoulder half the time.
1950 August 1, Bester, Alfred, “The Devil's Invention”, in Astounding Science Fiction, volume 45, number 6, page 139:
But Espers can’t pick up any EK brain pattern farther than the horizon. It’s direct wave transmission. Even large objects cannot be penetrated. A building, say, or a—