TgO Ex4:25 :וֻנסֵיבַת צִפֹרָה טִנָרָא וֻגזַרַת יָת עֻרלַת בְרַה‏ : Tsipporah took the piece of flint and cut off her son's foreskin
See the entire entry for ṭynr n.m. flint, rock

TgO Ex4:25 :בִדמָא דִמהוּלתָא הָדֵין‏ : by this blood of circumcision
See the entire entry for mhwlh#2 n.f. circumcision