Tazria, Thazria, Thazri'a, Sazria, or Ki Tazria' (תַזְרִיעַ—Hebrew for "childbirth", the 13th word, and the first distinctive word, in the parashah, where the root word זֶרַע means "seed") is the 27th weekly Torah portion (פָּרָשָׁה, parashah) in the annual Jewish cycle of Torah reading and the fourth in the Book of Leviticus. The parashah deals with ritual impurity.
(summary from Wikipedia.org)