Words related to cool
Proto-Indo-European root meaning "cold; to freeze."
It is the hypothetical source of/evidence for its existence is provided by: Latin gelare "to freeze," gelu "frost," glacies "ice;" Old English cald "cold, cool," German kalt.
1570s, "a vessel in which liquids or other things are set to cool," agent noun from cool (v.). Meaning "portable insulated box to keep things cool" is from 1944. Slang meaning "jail" is attested from 1884. Meaning "long, cold drink," especially a mildly alcoholic one based mainly on fruit juice or a soft drink, is by 1953.