Hallucination

hal-lū-sin-ā′shun, n. error: delusion: the perception of things that do not externally exist.— v.i. Hallū′cinate , to suffer illusion.— adjs. Hallū′cinative , Hallū′cinatory , partaking of or tending to produce hallucination. [L. hallucinationem — alucināri , -ātus , to wander in mind.]