goldfish: small golden or orange-red freshwater fishes of Eurasia used as pond or aquarium fishes
physical entity: an entity that has physical existence
ketamine: a general anesthetic and tranquilizer (not a barbiturate) that is administered intravenously or intramuscularly; used mainly by veterinarians or for minor surgery with geriatric or pediatric patients; taken in large doses it causes hallucinations similar to those associated with the use of PCP