To wander; to go astray; to err; to blunder; -- used of mental processes. Byron. [1913 Webster]
To perceive a non-existent object or phenomenon; to believe that one is experiencing something which in reality does not exist; to experience a hallucination{2}. [PJC]
, v. t.
To experience (something nonexistent) as an hallucination{2}. [PJC]