oral

The word "oral" entered English in the early 17th century from the Late Latin term "oralis," which itself derives from the classical Latin "os, oris," meaning "mouth." This Latin root can be traced back to the Proto-Indo-European (PIE) root "os-" or "ous-," which also meant "mouth" and is the ancestor of words for mouth in many Indo-European languages. The suffix "-alis" is a standard Latin adjectival formative. Thus, the literal construction "of or relating to the mouth" directly informs its primary modern meanings, which encompass the anatomical mouth, spoken communication (produced by the mouth), and the method of administering substances through the mouth.

Structure: or (mouth) + al (adjective suffix) The morpheme "or" originates from the Latin noun "os, oris" meaning "mouth." The morpheme "al" is a suffix of Latin origin ("-alis") used to form adjectives meaning "of, relating to, or characterized by."