Oneiric is an adjective used to describe something related to dreams or dream-like states. There are several synonyms for this word such as dreamy, ethereal, hallucinatory, surreal, and phantasmagoric. Dreamy is used to describe something that is characterized by a sense of peacefulness and tranquility, while ethereal is used to describe something that is delicate and otherworldly. Hallucinatory refers to something that is perceived as a hallucination, and surreal describes something that is bizarre or strange. Lastly, phantasmagoric is used to describe something that is characterized by a series of rapidly changing images or illusions, as if in a dream.