(adjective) - (1) Causing cold; a word used in science. From frigorificus, frigus, and facio, Latin. "Frigorific atoms or particles mean those nitrous salts which float in the air in cold weather, and occasion freezing."
--Samuel Johnson's Dictionary of the English Language, 1755
(2) Frigerifick particles, in Philosophy, small particles that are of a matter essentially cold.
--Nathaniel Bailey's Etymological English Dictionary, 1742