Of or pertaining to the mouth or ingestive opening: as, the oral orifice; oral surgery; oral gestation.Uttered by the mouth or in words; spoken, not written: as, oral traditions; oral testimony; oral law.Using or concerned with speech only, and not writing; communicating instruction, etc., by word of mouth; viva voce.In zoology, situated on the same part or side of the body as the mouth: opposed to aboral or anal.n. In crinoids, same as oral valve (which see, under oral).