Menstrual Blood
The menstrual blood of a woman.
("He who touches the male discharge and his flesh in the lying of his seed, and in the days of his impurity, and in the blood of the menstrual period, defiles two and invalidates one" - Zavam 85)
Translation
Expression (Hebrew)
דָּם נִדָּה
Definition (Hebrew)
דָּם הַמַּחְזוֹר שֶׁל הָאִשָּׁה.
("הַנּוֹגֵעַ בְּזוֹבוֹ שֶׁל זָב וּבְרֻקּוֹ בְּשִׁכְבַת זַרְעוֹ בְּמֵימֵי רַגְלָיו וּבְדַם הַנִּדָּה מְטַמֵּא שְׁנַיִם וּפוֹסֵל אֶחָד"- זָבִים ה ז)