psychonautn.

1978 Times 11/5 (advt.) Receptionist required, evening from 5 to about 7, Saturdays 10–6, or part of these times, by writers, psychonauts, near Marble Arch.

1991 S. Keen Fire in Belly iv. x. 142 The way of the psychonaut leads into the jungle of the psyche.

1994 J. Ott Ayahuasca Analogues 98 A self-experimenter like Heffter was later aptly characterized by famed German writer Ernst Jünger, in his logbook of personal drug experimentation..as a psychonaut, a voyager employing entheogenic drugs as his vehicle.

2002 Wired Sept. 118/1 His approach inspired the so-called psychonauts, a small group of scientifically sophisticated young explorers who post chemical syntheses, experimental results, and ‘Train Wrecks and Trip Disasters’ at Erowid.org.