טוּמְטוּם, (redupl. of טָמַם) a person whose genitals are hidden, or undevelopped; one whose sex is unknown. B. Bath. 126ᵇ ט׳ שנקרע וכ׳ a tumtum who was operated upon and was found to be a male. Bicc. IV, 5 (Talm. ed.); a. e.—[Midr. Till. to Ps. I; Yalk. Prov. 953 ט׳ הוא העולם, v. אַבְטוֹמְטוֹס.]—Pl. טוּמְטוּמִין. Yeb. 64ᵃ bot. (not טומטמין).