facial

the word 'facial' is a direct descendant from the latin adjective 'facialis', which itself is derived from 'facies', meaning face or form. the latin root 'facies' is believed to originate from the proto-indo-european root 'dhē-', meaning 'to set, put, or do', which also gave rise to concepts of making or shaping, thus linking to the idea of one's outward form or appearance. the suffix '-ialis' was a common latin adjectival ending that passed into english via old french as '-ial', consistently denoting a relationship. therefore, the literal construction 'pertaining to the face' has remained semantically transparent and stable from its classical origins to its modern english usage, both as an adjective and, by extension, as a noun for a related treatment.

Structure: fac (face) + ial (adjective suffix) fac (from latin 'facies', meaning face, form, appearance); ial (from latin '-ialis', an adjective-forming suffix meaning 'of or pertaining to').