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.
nerdnoun [ C ] uk â /nÉËd/ us â /nÉËd/ informal disapproving. âº a person, especially a man, who is not attractive and is awkward or socially embarrassing: He was a real nerd in high school - I can't believe he's so handsome now. âº a person who is extremely interested in one subject, especially computers, and knows a lot of facts about it: I'm a real grammar nerd.