Bekhorot 41: words to know

פְּסוּלֵי הַמּוּקְדָּשִׁין (pesulei hamukdashin): disqualified consecrated animals. Refers to sanctified animals that developed a blemish and can be redeemed.
בַּמְּדִינָה (bamidinah): outside the Temple (lit. in the province). Contrasted with 'in the Temple' regarding where a firstborn may be slaughtered.
טוּמְטוּם (tumtum): one of concealed sexual organs. Discussed as an animal whose gender is in doubt, disqualifying it from slaughter.
אַנְדְּרוֹגִינוֹס (anderoginos): hermaphrodite; bearing both sex organs. Debated whether its female organ is considered a blemish or makes it a separate category.
לְמַאי נָפְקָא מִינַּהּ (lemai nafka minah): what is the practical halakhic difference?. Asks what practical difference emerges from Rava's dilemma about Rabbi Yishmael's reasoning.