The word 'vaginal' originates from the Latin vāgīna, which literally meant a sheath or scabbard for a sword. In anatomical terminology, this term was adopted in the 17th century as a learned metaphor, comparing the bodily canal to a protective covering or sheath. The suffix -ālis, also from Latin, is a standard adjectival formant. Thus, the literal "pertaining to a sheath" evolved into the modern, specific anatomical sense of "pertaining to the vagina."

Structure: vagin (sheath, vagina) + al (adjective suffix) - vagin: From Latin vāgīna, meaning "sheath, scabbard". - al: A suffix forming adjectives, from Latin -ālis.