What is the Latin word for hallucination?

The usual Latin words for “hallucination” are ālūcinātiō, ineptia. The right choice depends on the sense; see the distinctions below.

English → Latin

“hallucination” in Latin

ālūcinātiōwandering of the mind, dreaminess, reverie ineptiasilliness, folly, absurdity

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

hallucination

alucinatio (Sen., sic vestras alucinationes fero, ut, etc.; but Nonius says it was used by the “veteres”): ineptiae (folly). [Vid. BLUNDER, ERROR.]

In medicine, *dysaesthesia (technical term).

Quick answer

What is the Latin word for hallucination?: The usual Latin words for “hallucination” are ālūcinātiō, ineptia. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.