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.
Moron is a term once used in psychology to denote mild intellectual disability.The term was closely tied with the American eugenics movement. Once the term became popularized, it fell out of use by the psychological community, as it was used more commonly as an insult than as a psychological term.he word moron, along with others including, idiotic, imbecilic, stupid, and  feeble-minded , was formerly considered a valid descriptor in the psychological community, but it is now deprecated in use by psychologists.