A debate persists on criteria which would easily differentiate a substance which is 'psychedelic' from one 'hallucinogenic'. Sir Thomas Browne in 1646 coined the term 'hallucination' from the Latin word "alucinari" meaning "to wander in the mind".
The Three Types of Hallucinogens: Psychedelics, Dissociatives, and Deliriants. Human hallucinogen use precedes written history, and has shaped many lives and cultures throughout time.
Deliriants are a class of hallucinogen that are unique in that, even with lower doses, they offer solid hallucinations which display themselves seamlessly into waking consciousness, similar to fully formed dreams or delusions.