abstract:Tumtum (טומטום in Hebrew, meaning "hidden") is a term that appears in Jewish Rabbinic literature and usually refers to a person whose sex is unknown, because their genitalia are covered or "hidden." Although they are often grouped together, the Tumtum has some halachic ramifications distinct from those of the Androgynos (אנדרוגינוס), who has both male and female genitalia (see Talmud Bavli, Tractate Hagigah, 4a).