oral Look up oral at Dictionary.com
1625, from L.L. oralis, from L. os (gen. oris) "mouth, opening, face, entrance," from PIE *os-/*ous- "mouth" (cf. Skt. asan "mouth," asyam "mouth, opening," Avestan ah-, Hittite aish, M.Ir. a "mouth," O.N. oss "mouth of a river," O.E. or "beginning, origin, front"). Psychological meaning "of the mouth as the focus of infantile sexual energy" (e.g. oral fixation) is from 1910. The sexual sense is first recorded 1948, in Kinsey.