glacial

The word 'glacial' has a direct and literal origin in the Latin word for ice, 'glacies'. The adjective-forming suffix '-alis' was attached to create the Late Latin term 'glacialis', meaning 'icy' or 'frozen'. This term passed into French as 'glacial' before being adopted into English in the mid-17th century. While its primary scientific meaning pertains to ice and glaciers, its figurative use to describe an extremely cold demeanor or atmosphere logically extends from the physical properties of ice, evoking a sense of emotional chill and stillness.

Structure: glaci (ice) + al (adjective suffix) glaci (from Latin 'glacies', meaning 'ice'); al (a suffix forming adjectives from nouns, from Latin '-alis')