Noun. 1. refrigerant-any substance used to provide cooling (as in a refrigerator). substance-a particular kind or species of matter with uniform properties; shigella is one of the most toxic substances known to man.cryogen-a liquid that boils at below -160 C and is used as a refrigerant.. A substance, such as air, ammonia, water, or carbon dioxide, used to provide cooling either as the working substance of a refrigerator or by direct absorption of heat. 2. Medicine An agent used to reduce fever.
usually offensive: a person affected with extreme mental retardation. 2. : a foolish or stupid person. â idiot adjective. See idiot defined for English-language learners.
Morphine is a drug that is used as an anaesthetic. It is derived from opium and it affects the central nervous system relieving pain. The discovery of morphine The origins of morphine can be traced back to 1522 when the scientist and alchemist Paracelsus is said to have used laudanum, as a pain killer. He advised that this should be used sparingly.