vaginal (adj.)

"sexual passage of the female from the vulva to the uterus," 1680s, medical Latin, from specialized use of Latin vagina "sheath, scabbard, covering; sheath of an ear of grain, hull, husk" (plural vaginae), a word of uncertain origin. Perhaps cognate with Lithuanian vožiu, vožti  "to cover with a hollow thing," but de Vaan points out that "Obviously, this is a gratuitous proposal." A modern medical word; the Latin word was not used in an anatomical sense in classical times. Anthropological vagina dentata is attested from 1902.

suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).