»gelid

gelid comes from Latin gelidus, from gelu, "frost, cold."

gelid \JEH-lid\ "extremely cold, icy"

From Usenet (post itself unattributed, modifications mine): "Gelid" is used in English to describe anything of extremely cold temperature (as in "the gelid waters of the Arctic Ocean"), but the word can also be used figuratively to describe a person with a cold demeanor (as in "the criminal's gelid stare"). "Gelid" first appeared in English late in the 16th century. The related gelatin refers to an edible jelly that undergoes a cooling process as part of its formation, and comes from the verb gelare, "to freeze.")